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diff --git a/dom/base/nsFrameLoader.h b/dom/base/nsFrameLoader.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Class for managing loading of a subframe (creation of the docshell,
+ * handling of loads in it, recursion-checking).
+ */
+
+#ifndef nsFrameLoader_h_
+#define nsFrameLoader_h_
+
+#include <cstdint>
+#include "ErrorList.h"
+#include "Units.h"
+#include "js/RootingAPI.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/LinkedList.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/Nullable.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/WindowProxyHolder.h"
+#include "mozilla/dom/ipc/IdType.h"
+#include "mozilla/layers/LayersTypes.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsDocShell.h"
+#include "mozilla/dom/MessageManagerCallback.h"
+#include "nsID.h"
+#include "nsIFrame.h"
+#include "nsIMutationObserver.h"
+#include "nsISupports.h"
+#include "nsRect.h"
+#include "nsStringFwd.h"
+#include "nsStubMutationObserver.h"
+#include "nsWrapperCache.h"
+
+class nsIURI;
+class nsSubDocumentFrame;
+class AutoResetInShow;
+class AutoResetInFrameSwap;
+class nsFrameLoaderOwner;
+class nsIRemoteTab;
+class nsIDocShellTreeItem;
+class nsIDocShellTreeOwner;
+class nsILoadContext;
+class nsIPrintSettings;
+class nsIWebBrowserPersistDocumentReceiver;
+class nsIWebProgressListener;
+class nsIOpenWindowInfo;
+
+namespace mozilla {
+
+class OriginAttributes;
+
+namespace dom {
+class ChromeMessageSender;
+class ContentParent;
+class Document;
+class Element;
+class InProcessBrowserChildMessageManager;
+class MessageSender;
+class ProcessMessageManager;
+class BrowserParent;
+class MutableTabContext;
+class BrowserBridgeChild;
+class RemoteBrowser;
+struct RemotenessOptions;
+struct NavigationIsolationOptions;
+class SessionStoreChild;
+class SessionStoreParent;
+
+namespace ipc {
+class StructuredCloneData;
+}  // namespace ipc
+
+}  // namespace dom
+
+namespace ipc {
+class MessageChannel;
+}  // namespace ipc
+}  // namespace mozilla
+
+#if defined(MOZ_WIDGET_GTK)
+typedef struct _GtkWidget GtkWidget;
+#endif
+
+// IID for nsFrameLoader, because some places want to QI to it.
+#define NS_FRAMELOADER_IID                           \
+  {                                                  \
+    0x297fd0ea, 0x1b4a, 0x4c9a, {                    \
+      0xa4, 0x04, 0xe5, 0x8b, 0xe8, 0x95, 0x10, 0x50 \
+    }                                                \
+  }
+
+class nsFrameLoader final : public nsStubMutationObserver,
+                            public mozilla::dom::ipc::MessageManagerCallback,
+                            public nsWrapperCache,
+                            public mozilla::LinkedListElement<nsFrameLoader> {
+  friend class AutoResetInShow;
+  friend class AutoResetInFrameSwap;
+  friend class nsFrameLoaderOwner;
+  using Document = mozilla::dom::Document;
+  using Element = mozilla::dom::Element;
+  using BrowserParent = mozilla::dom::BrowserParent;
+  using BrowserBridgeChild = mozilla::dom::BrowserBridgeChild;
+  using BrowsingContext = mozilla::dom::BrowsingContext;
+  using BrowsingContextGroup = mozilla::dom::BrowsingContextGroup;
+  using Promise = mozilla::dom::Promise;
+
+ public:
+  // Called by Frame Elements to create a new FrameLoader.
+  static already_AddRefed<nsFrameLoader> Create(
+      Element* aOwner, bool aNetworkCreated,
+      nsIOpenWindowInfo* aOpenWindowInfo = nullptr);
+
+  // Called by nsFrameLoaderOwner::ChangeRemoteness when switching out
+  // FrameLoaders.
+  static already_AddRefed<nsFrameLoader> Recreate(
+      Element* aOwner, BrowsingContext* aContext, BrowsingContextGroup* aGroup,
+      const mozilla::dom::NavigationIsolationOptions& aRemotenessOptions,
+      bool aIsRemote, bool aNetworkCreated, bool aPreserveContext);
+
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_FRAMELOADER_IID)
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(nsFrameLoader)
+
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+  nsresult CheckForRecursiveLoad(nsIURI* aURI);
+  nsresult ReallyStartLoading();
+  void StartDestroy(bool aForProcessSwitch);
+  void DestroyDocShell();
+  void DestroyComplete();
+  nsDocShell* GetExistingDocShell() const { return mDocShell; }
+  mozilla::dom::InProcessBrowserChildMessageManager*
+  GetBrowserChildMessageManager() const {
+    return mChildMessageManager;
+  }
+  nsresult UpdatePositionAndSize(nsSubDocumentFrame* aIFrame);
+  void PropagateIsUnderHiddenEmbedderElement(
+      bool aIsUnderHiddenEmbedderElement);
+
+  void UpdateRemoteStyle(mozilla::StyleImageRendering aImageRendering);
+
+  // When creating a nsFrameLoaderOwner which is a static clone, a
+  // `nsFrameLoader` is not immediately attached to it. Instead, it is added to
+  // the static clone document's `PendingFrameStaticClones` list.
+  //
+  // After the parent document has been fully cloned, a new frameloader will be
+  // created for the cloned iframe, and `FinishStaticClone` will be called on
+  // it, which will clone the inner document of the source nsFrameLoader.
+  nsresult FinishStaticClone(nsFrameLoader* aStaticCloneOf,
+                             nsIPrintSettings* aPrintSettings,
+                             bool* aOutHasInProcessPrintCallbacks);
+
+  nsresult DoRemoteStaticClone(nsFrameLoader* aStaticCloneOf,
+                               nsIPrintSettings* aPrintSettings);
+
+  // WebIDL methods
+
+  nsDocShell* GetDocShell(mozilla::ErrorResult& aRv);
+
+  already_AddRefed<nsIRemoteTab> GetRemoteTab();
+
+  already_AddRefed<nsILoadContext> GetLoadContext();
+
+  mozilla::dom::BrowsingContext* GetBrowsingContext();
+  mozilla::dom::BrowsingContext* GetExtantBrowsingContext();
+  mozilla::dom::BrowsingContext* GetMaybePendingBrowsingContext() {
+    return mPendingBrowsingContext;
+  }
+
+  /**
+   * Start loading the frame. This method figures out what to load
+   * from the owner content in the frame loader.
+   */
+  void LoadFrame(bool aOriginalSrc);
+
+  /**
+   * Loads the specified URI in this frame. Behaves identically to loadFrame,
+   * except that this method allows specifying the URI to load.
+   *
+   * @param aURI The URI to load.
+   * @param aTriggeringPrincipal The triggering principal for the load. May be
+   *        null, in which case the node principal of the owner content will be
+   *        used.
+   * @param aCsp The CSP to be used for the load. That is not the CSP to be
+   *        applied to subresources within the frame, but to the iframe load
+   *        itself. E.g. if the CSP holds upgrade-insecure-requests the the
+   *        frame load is upgraded from http to https.
+   */
+  nsresult LoadURI(nsIURI* aURI, nsIPrincipal* aTriggeringPrincipal,
+                   nsIContentSecurityPolicy* aCsp, bool aOriginalSrc);
+
+  /**
+   * Resume a redirected load within this frame.
+   *
+   * @param aPendingSwitchID ID of a process-switching load to be reusmed
+   *        within this frame.
+   */
+  void ResumeLoad(uint64_t aPendingSwitchID);
+
+  /**
+   * Destroy the frame loader and everything inside it. This will
+   * clear the weak owner content reference.
+   */
+  void Destroy(bool aForProcessSwitch = false);
+
+  void AsyncDestroy() {
+    mNeedsAsyncDestroy = true;
+    Destroy();
+  }
+
+  void RequestUpdatePosition(mozilla::ErrorResult& aRv);
+
+  already_AddRefed<Promise> RequestTabStateFlush(mozilla::ErrorResult& aRv);
+
+  void RequestEpochUpdate(uint32_t aEpoch);
+
+  void RequestSHistoryUpdate();
+
+  MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> PrintPreview(
+      nsIPrintSettings* aPrintSettings, BrowsingContext* aSourceBC,
+      mozilla::ErrorResult& aRv);
+
+  void ExitPrintPreview();
+
+  void StartPersistence(BrowsingContext* aContext,
+                        nsIWebBrowserPersistDocumentReceiver* aRecv,
+                        mozilla::ErrorResult& aRv);
+
+  // WebIDL getters
+
+  already_AddRefed<mozilla::dom::MessageSender> GetMessageManager();
+
+  already_AddRefed<Element> GetOwnerElement();
+
+  uint32_t LazyWidth() const;
+
+  uint32_t LazyHeight() const;
+
+  uint64_t ChildID() const { return mChildID; }
+
+  bool DepthTooGreat() const { return mDepthTooGreat; }
+
+  bool IsDead() const { return mDestroyCalled; }
+
+  bool IsNetworkCreated() const { return mNetworkCreated; }
+
+  /**
+   * Is this a frame loader for a bona fide <iframe mozbrowser>?
+   * <xul:browser> is not a mozbrowser, so this is false for that case.
+   */
+  bool OwnerIsMozBrowserFrame();
+
+  nsIContent* GetParentObject() const;
+
+  /**
+   * MessageManagerCallback methods that we override.
+   */
+  virtual bool DoLoadMessageManagerScript(const nsAString& aURL,
+                                          bool aRunInGlobalScope) override;
+  virtual nsresult DoSendAsyncMessage(
+      const nsAString& aMessage,
+      mozilla::dom::ipc::StructuredCloneData& aData) override;
+
+  /**
+   * Called from the layout frame associated with this frame loader;
+   * this notifies us to hook up with the widget and view.
+   */
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY bool Show(nsSubDocumentFrame*);
+
+  void MaybeShowFrame();
+
+  /**
+   * Called when the margin properties of the containing frame are changed.
+   */
+  void MarginsChanged();
+
+  /**
+   * Called from the layout frame associated with this frame loader, when
+   * the frame is being torn down; this notifies us that out widget and view
+   * are going away and we should unhook from them.
+   */
+  void Hide();
+
+  // Used when content is causing a FrameLoader to be created, and
+  // needs to try forcing layout to flush in order to get accurate
+  // dimensions for the content area.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void ForceLayoutIfNecessary();
+
+  // The guts of an nsFrameLoaderOwner::SwapFrameLoader implementation.  A
+  // frame loader owner needs to call this, and pass in the two references to
+  // nsRefPtrs for frame loaders that need to be swapped.
+  nsresult SwapWithOtherLoader(nsFrameLoader* aOther,
+                               nsFrameLoaderOwner* aThisOwner,
+                               nsFrameLoaderOwner* aOtherOwner);
+
+  nsresult SwapWithOtherRemoteLoader(nsFrameLoader* aOther,
+                                     nsFrameLoaderOwner* aThisOwner,
+                                     nsFrameLoaderOwner* aOtherOwner);
+
+  /**
+   * Return the primary frame for our owning content, or null if it
+   * can't be found.
+   */
+  nsIFrame* GetPrimaryFrameOfOwningContent() const;
+
+  /**
+   * Return the document that owns this, or null if we don't have
+   * an owner.
+   */
+  Document* GetOwnerDoc() const;
+
+  /**
+   * Returns whether this frame is a remote frame.
+   *
+   * This is true for either a top-level remote browser in the parent process,
+   * or a remote subframe in the child process.
+   */
+  bool IsRemoteFrame();
+
+  mozilla::dom::RemoteBrowser* GetRemoteBrowser() const;
+
+  /**
+   * Returns the IPDL actor used if this is a top-level remote browser, or null
+   * otherwise.
+   */
+  BrowserParent* GetBrowserParent() const;
+
+  /**
+   * Returns the IPDL actor used if this is an out-of-process iframe, or null
+   * otherwise.
+   */
+  BrowserBridgeChild* GetBrowserBridgeChild() const;
+
+  /**
+   * Returns the layers ID that this remote frame is using to render.
+   *
+   * This must only be called if this is a remote frame.
+   */
+  mozilla::layers::LayersId GetLayersId() const;
+
+  mozilla::dom::ChromeMessageSender* GetFrameMessageManager() {
+    return mMessageManager;
+  }
+
+  mozilla::dom::Element* GetOwnerContent() { return mOwnerContent; }
+
+  /**
+   * Stashes a detached nsIFrame on the frame loader. We do this when we're
+   * destroying the nsSubDocumentFrame. If the nsSubdocumentFrame is
+   * being reframed we'll restore the detached nsIFrame when it's recreated,
+   * otherwise we'll discard the old presentation and set the detached
+   * subdoc nsIFrame to null. aContainerDoc is the document containing the
+   * the subdoc frame. This enables us to detect when the containing
+   * document has changed during reframe, so we can discard the presentation
+   * in that case.
+   */
+  void SetDetachedSubdocFrame(nsIFrame* aDetachedFrame,
+                              Document* aContainerDoc);
+
+  /**
+   * Retrieves the detached nsIFrame and the document containing the nsIFrame,
+   * as set by SetDetachedSubdocFrame().
+   */
+  nsIFrame* GetDetachedSubdocFrame(Document** aContainerDoc) const;
+
+  /**
+   * Applies a new set of sandbox flags. These are merged with the sandbox
+   * flags from our owning content's owning document with a logical OR, this
+   * ensures that we can only add restrictions and never remove them.
+   */
+  void ApplySandboxFlags(uint32_t sandboxFlags);
+
+  void GetURL(nsString& aURL, nsIPrincipal** aTriggeringPrincipal,
+              nsIContentSecurityPolicy** aCsp);
+
+  // Properly retrieves documentSize of any subdocument type.
+  nsresult GetWindowDimensions(nsIntRect& aRect);
+
+  virtual mozilla::dom::ProcessMessageManager* GetProcessMessageManager()
+      const override;
+
+  // public because a callback needs these.
+  RefPtr<mozilla::dom::ChromeMessageSender> mMessageManager;
+  RefPtr<mozilla::dom::InProcessBrowserChildMessageManager>
+      mChildMessageManager;
+
+  virtual JSObject* WrapObject(JSContext* cx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  void SetWillChangeProcess();
+
+  // Configure which remote process should be used to host the remote browser
+  // created in `TryRemoteBrowser`. This method _must_ be called before
+  // `TryRemoteBrowser`, and a script blocker must be on the stack.
+  //
+  // |aContentParent|, if set, must have the remote type |aRemoteType|.
+  void ConfigRemoteProcess(const nsACString& aRemoteType,
+                           mozilla::dom::ContentParent* aContentParent);
+
+  // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void MaybeNotifyCrashed(
+      mozilla::dom::BrowsingContext* aBrowsingContext,
+      mozilla::dom::ContentParentId aChildID,
+      mozilla::ipc::MessageChannel* aChannel);
+
+  void FireErrorEvent();
+
+  mozilla::dom::SessionStoreChild* GetSessionStoreChild() {
+    return mSessionStoreChild;
+  }
+
+  mozilla::dom::SessionStoreParent* GetSessionStoreParent();
+
+ private:
+  nsFrameLoader(mozilla::dom::Element* aOwner,
+                mozilla::dom::BrowsingContext* aBrowsingContext, bool aIsRemote,
+                bool aNetworkCreated);
+  ~nsFrameLoader();
+
+  void SetOwnerContent(mozilla::dom::Element* aContent);
+
+  /**
+   * Get our owning element's app manifest URL, or return the empty string if
+   * our owning element doesn't have an app manifest URL.
+   */
+  void GetOwnerAppManifestURL(nsAString& aOut);
+
+  /**
+   * If we are an IPC frame, set mRemoteFrame. Otherwise, create and
+   * initialize mDocShell.
+   */
+  nsresult MaybeCreateDocShell();
+  nsresult EnsureMessageManager();
+  nsresult ReallyLoadFrameScripts();
+  nsDocShell* GetDocShell() const { return mDocShell; }
+
+  void AssertSafeToInit();
+
+  // Updates the subdocument position and size. This gets called only
+  // when we have our own in-process DocShell.
+  void UpdateBaseWindowPositionAndSize(nsSubDocumentFrame* aIFrame);
+
+  /**
+   * Checks whether a load of the given URI should be allowed, and returns an
+   * error result if it should not.
+   *
+   * @param aURI The URI to check.
+   * @param aTriggeringPrincipal The triggering principal for the load. May be
+   *        null, in which case the node principal of the owner content is used.
+   */
+  nsresult CheckURILoad(nsIURI* aURI, nsIPrincipal* aTriggeringPrincipal);
+  nsresult ReallyStartLoadingInternal();
+
+  // Returns true if we have a remote browser or else attempts to create a
+  // remote browser and returns true if successful.
+  bool EnsureRemoteBrowser();
+
+  // Return true if remote browser created; nothing else to do
+  bool TryRemoteBrowser();
+  bool TryRemoteBrowserInternal();
+
+  // Tell the remote browser that it's now "virtually visible"
+  bool ShowRemoteFrame(const mozilla::ScreenIntSize& size,
+                       nsSubDocumentFrame* aFrame = nullptr);
+
+  void AddTreeItemToTreeOwner(nsIDocShellTreeItem* aItem,
+                              nsIDocShellTreeOwner* aOwner);
+
+  void InitializeBrowserAPI();
+  void DestroyBrowserFrameScripts();
+
+  nsresult GetNewTabContext(mozilla::dom::MutableTabContext* aTabContext,
+                            nsIURI* aURI = nullptr);
+
+  enum BrowserParentChange { eBrowserParentRemoved, eBrowserParentChanged };
+  void MaybeUpdatePrimaryBrowserParent(BrowserParentChange aChange);
+
+  nsresult PopulateOriginContextIdsFromAttributes(
+      mozilla::OriginAttributes& aAttr);
+
+  bool EnsureBrowsingContextAttached();
+
+  // Invoke the callback from nsOpenWindowInfo to indicate that a
+  // browsing context for a newly opened tab/window is ready.
+  void InvokeBrowsingContextReadyCallback();
+
+  void RequestFinalTabStateFlush();
+
+  RefPtr<mozilla::dom::BrowsingContext> mPendingBrowsingContext;
+  nsCOMPtr<nsIURI> mURIToLoad;
+  nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
+  nsCOMPtr<nsIContentSecurityPolicy> mCsp;
+  nsCOMPtr<nsIOpenWindowInfo> mOpenWindowInfo;
+  mozilla::dom::Element* mOwnerContent;  // WEAK
+
+  // After the frameloader has been removed from the DOM but before all of the
+  // messages from the frame have been received, we keep a strong reference to
+  // our <browser> element.
+  RefPtr<mozilla::dom::Element> mOwnerContentStrong;
+
+  // Stores the root frame of the subdocument while the subdocument is being
+  // reframed. Used to restore the presentation after reframing.
+  WeakFrame mDetachedSubdocFrame;
+  // Stores the containing document of the frame corresponding to this
+  // frame loader. This is reference is kept valid while the subframe's
+  // presentation is detached and stored in mDetachedSubdocFrame. This
+  // enables us to detect whether the frame has moved documents during
+  // a reframe, so that we know not to restore the presentation.
+  RefPtr<Document> mContainerDocWhileDetached;
+
+  // When performing a process switch, this value is used rather than mURIToLoad
+  // to identify the process-switching load which should be resumed in the
+  // target process.
+  uint64_t mPendingSwitchID;
+
+  uint64_t mChildID;
+  RefPtr<mozilla::dom::RemoteBrowser> mRemoteBrowser;
+  RefPtr<nsDocShell> mDocShell;
+
+  // Holds the last known size of the frame.
+  mozilla::ScreenIntSize mLazySize;
+
+  // Actor for collecting session store data from content children. This will be
+  // cleared and set to null eagerly when taking down the frameloader to break
+  // refcounted cycles early.
+  RefPtr<mozilla::dom::SessionStoreChild> mSessionStoreChild;
+
+  nsCString mRemoteType;
+
+  bool mInitialized : 1;
+  bool mDepthTooGreat : 1;
+  bool mIsTopLevelContent : 1;
+  bool mDestroyCalled : 1;
+  bool mNeedsAsyncDestroy : 1;
+  bool mInSwap : 1;
+  bool mInShow : 1;
+  bool mHideCalled : 1;
+  // True when the object is created for an element which the parser has
+  // created using NS_FROM_PARSER_NETWORK flag. If the element is modified,
+  // it may lose the flag.
+  bool mNetworkCreated : 1;
+
+  // True if a pending load corresponds to the original src (or srcdoc)
+  // attribute of the frame element.
+  bool mLoadingOriginalSrc : 1;
+
+  bool mRemoteBrowserShown : 1;
+  bool mIsRemoteFrame : 1;
+  // If true, the FrameLoader will be re-created with the same BrowsingContext,
+  // but for a different process, after it is destroyed.
+  bool mWillChangeProcess : 1;
+  bool mObservingOwnerContent : 1;
+
+  // When an out-of-process nsFrameLoader crashes, an event is fired on the
+  // frame. To ensure this is only fired once, this bit is checked.
+  bool mTabProcessCrashFired : 1;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsFrameLoader, NS_FRAMELOADER_IID)
+
+inline nsISupports* ToSupports(nsFrameLoader* aFrameLoader) {
+  return aFrameLoader;
+}
+
+#endif