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diff --git a/xpcom/build/nsXPCOM.h b/xpcom/build/nsXPCOM.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/. */
+
+#ifndef nsXPCOM_h__
+#define nsXPCOM_h__
+
+#include "nscore.h"
+#include "nsXPCOMCID.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Atomics.h"
+
+#ifdef __cplusplus
+#  define DECL_CLASS(c) class c
+#  define DECL_STRUCT(c) struct c
+#else
+#  define DECL_CLASS(c) typedef struct c c
+#  define DECL_STRUCT(c) typedef struct c c
+#endif
+
+DECL_CLASS(nsISupports);
+DECL_CLASS(nsIComponentManager);
+DECL_CLASS(nsIComponentRegistrar);
+DECL_CLASS(nsIServiceManager);
+DECL_CLASS(nsIFile);
+DECL_CLASS(nsIDirectoryServiceProvider);
+DECL_CLASS(nsIMemory);
+DECL_CLASS(nsIDebug2);
+
+#ifdef __cplusplus
+extern bool gXPCOMShuttingDown;
+extern bool gXPCOMMainThreadEventsAreDoomed;
+#endif
+
+#ifdef __cplusplus
+#  include "nsStringFwd.h"
+#endif
+
+/**
+ * Initialises XPCOM. You must call one of the NS_InitXPCOM methods
+ * before proceeding to use xpcom. The one exception is that you may
+ * call NS_NewLocalFile to create a nsIFile.
+ *
+ * @note Use <CODE>NS_NewLocalFile</CODE> or <CODE>NS_NewNativeLocalFile</CODE>
+ *       to create the file object you supply as the bin directory path in this
+ *       call. The function may be safely called before the rest of XPCOM or
+ *       embedding has been initialised.
+ *
+ * @param aResult          The service manager.  You may pass null.
+ *
+ * @param aBinDirectory    The directory containing the component
+ *                         registry and runtime libraries;
+ *                         or use <CODE>nullptr</CODE> to use the working
+ *                         directory.
+ *
+ * @param aAppFileLocationProvider The object to be used by Gecko that
+ *                         specifies to Gecko where to find profiles, the
+ *                         component registry preferences and so on; or use
+ *                         <CODE>nullptr</CODE> for the default behaviour.
+ *
+ * @param aInitJSContext   Whether the nsXPCJSContext should be initialized at
+ *                         this point.
+ *
+ * @see NS_NewLocalFile
+ * @see nsIFile
+ * @see nsIDirectoryServiceProvider
+ *
+ * @return NS_OK for success;
+ *         NS_ERROR_NOT_INITIALIZED if static globals were not initialized,
+ *         which can happen if XPCOM is reloaded, but did not completly
+ *         shutdown. Other error codes indicate a failure during
+ *         initialisation.
+ */
+XPCOM_API(nsresult)
+NS_InitXPCOM(nsIServiceManager** aResult, nsIFile* aBinDirectory,
+             nsIDirectoryServiceProvider* aAppFileLocationProvider,
+             bool aInitJSContext = true);
+
+/**
+ * Initialize only minimal components of XPCOM. This ensures nsThreadManager,
+ * logging, and timers will work.
+ */
+XPCOM_API(nsresult)
+NS_InitMinimalXPCOM();
+
+/**
+ * Shutdown XPCOM. You must call this method after you are finished
+ * using xpcom.
+ *
+ * @param aServMgr          The service manager which was returned by
+ * NS_InitXPCOM. This will release servMgr.  You may pass null.
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ *
+ * MOZ_CAN_RUN_SCRIPT_BOUNDARY for now, but really it should maybe be
+ * MOZ_CAN_RUN_SCRIPT.
+ */
+XPCOM_API(MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult)
+NS_ShutdownXPCOM(nsIServiceManager* aServMgr);
+
+/**
+ * Public Method to access to the service manager.
+ *
+ * @param aResult Interface pointer to the service manager
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ */
+XPCOM_API(nsresult) NS_GetServiceManager(nsIServiceManager** aResult);
+
+/**
+ * Public Method to access to the component manager.
+ *
+ * @param aResult Interface pointer to the service
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ */
+XPCOM_API(nsresult) NS_GetComponentManager(nsIComponentManager** aResult);
+
+/**
+ * Public Method to access to the component registration manager.
+ *
+ * @param aResult Interface pointer to the service
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ */
+XPCOM_API(nsresult) NS_GetComponentRegistrar(nsIComponentRegistrar** aResult);
+
+/**
+ * Public Method to create an instance of a nsIFile.  This function
+ * may be called prior to NS_InitXPCOM.
+ *
+ *   @param aPath
+ *       A string which specifies a full file path to a
+ *       location.  Relative paths will be treated as an
+ *       error (NS_ERROR_FILE_UNRECOGNIZED_PATH).
+ *       |NS_NewNativeLocalFile|'s path must be in the
+ *       filesystem charset.
+ *   @param aFollowLinks
+ *       This attribute will determine if the nsLocalFile will auto
+ *       resolve symbolic links.  By default, this value will be false
+ *       on all non unix systems.  On unix, this attribute is effectively
+ *       a noop.
+ * @param aResult Interface pointer to a new instance of an nsIFile
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure.
+ */
+
+#ifdef __cplusplus
+
+XPCOM_API(nsresult)
+NS_NewLocalFile(const nsAString& aPath, bool aFollowLinks, nsIFile** aResult);
+
+XPCOM_API(nsresult)
+NS_NewNativeLocalFile(const nsACString& aPath, bool aFollowLinks,
+                      nsIFile** aResult);
+
+// Use NS_NewLocalFile if you already have a UTF-16 string.
+// Otherwise non-ASCII paths will break on some platforms
+// including Windows.
+class NS_ConvertUTF16toUTF8;
+nsresult NS_NewNativeLocalFile(const NS_ConvertUTF16toUTF8& aPath,
+                               bool aFollowLinks, nsIFile** aResult) = delete;
+
+#endif
+
+/**
+ * Support for warnings, assertions, and debugging breaks.
+ */
+
+enum {
+  NS_DEBUG_WARNING = 0,
+  NS_DEBUG_ASSERTION = 1,
+  NS_DEBUG_BREAK = 2,
+  NS_DEBUG_ABORT = 3
+};
+
+/**
+ * Print a runtime assertion. This function is available in both debug and
+ * release builds.
+ *
+ * @note Based on the value of aSeverity and the XPCOM_DEBUG_BREAK
+ * environment variable, this function may cause the application to
+ * print the warning, print a stacktrace, break into a debugger, or abort
+ * immediately.
+ *
+ * @param aSeverity A NS_DEBUG_* value
+ * @param aStr   A readable error message (ASCII, may be null)
+ * @param aExpr  The expression evaluated (may be null)
+ * @param aFile  The source file containing the assertion (may be null)
+ * @param aLine  The source file line number (-1 indicates no line number)
+ */
+XPCOM_API(void)
+NS_DebugBreak(uint32_t aSeverity, const char* aStr, const char* aExpr,
+              const char* aFile, int32_t aLine);
+
+/**
+ * Perform a stack-walk to a debugging log under various
+ * circumstances. Used to aid debugging of leaked object graphs.
+ *
+ * The NS_Log* functions are available in both debug and release
+ * builds of XPCOM, but the output will be useless unless binary
+ * debugging symbols for all modules in the stacktrace are available.
+ */
+
+/**
+ * By default, refcount logging is enabled at NS_InitXPCOM and
+ * refcount statistics are printed at NS_ShutdownXPCOM. NS_LogInit and
+ * NS_LogTerm allow applications to enable logging earlier and delay
+ * printing of logging statistics. They should always be used as a
+ * matched pair.
+ */
+XPCOM_API(void) NS_LogInit();
+
+XPCOM_API(void) NS_LogTerm();
+
+#ifdef __cplusplus
+/**
+ * A helper class that calls NS_LogInit in its constructor and
+ * NS_LogTerm in its destructor.
+ */
+
+class ScopedLogging {
+ public:
+  ScopedLogging() { NS_LogInit(); }
+
+  ~ScopedLogging() { NS_LogTerm(); }
+};
+#endif
+
+/**
+ * Log construction and destruction of objects. Processing tools can use the
+ * stacktraces printed by these functions to identify objects that are being
+ * leaked.
+ *
+ * @param aPtr          A pointer to the concrete object.
+ * @param aTypeName     The class name of the type
+ * @param aInstanceSize The size of the type
+ */
+
+XPCOM_API(void)
+NS_LogCtor(void* aPtr, const char* aTypeName, uint32_t aInstanceSize);
+
+XPCOM_API(void)
+NS_LogDtor(void* aPtr, const char* aTypeName, uint32_t aInstanceSize);
+
+/**
+ * Log a stacktrace when an XPCOM object's refcount is incremented or
+ * decremented. Processing tools can use the stacktraces printed by these
+ * functions to identify objects that were leaked due to XPCOM references.
+ *
+ * @param aPtr          A pointer to the concrete object
+ * @param aNewRefCnt    The new reference count.
+ * @param aTypeName     The class name of the type
+ * @param aInstanceSize The size of the type
+ */
+XPCOM_API(void)
+NS_LogAddRef(void* aPtr, nsrefcnt aNewRefCnt, const char* aTypeName,
+             uint32_t aInstanceSize);
+
+XPCOM_API(void)
+NS_LogRelease(void* aPtr, nsrefcnt aNewRefCnt, const char* aTypeName);
+
+/**
+ * Log reference counting performed by COMPtrs. Processing tools can
+ * use the stacktraces printed by these functions to simplify reports
+ * about leaked objects generated from the data printed by
+ * NS_LogAddRef/NS_LogRelease.
+ *
+ * @param aCOMPtr the address of the COMPtr holding a strong reference
+ * @param aObject the object being referenced by the COMPtr
+ */
+
+XPCOM_API(void) NS_LogCOMPtrAddRef(void* aCOMPtr, nsISupports* aObject);
+
+XPCOM_API(void) NS_LogCOMPtrRelease(void* aCOMPtr, nsISupports* aObject);
+
+/**
+ * The XPCOM cycle collector analyzes and breaks reference cycles between
+ * participating XPCOM objects. All objects in the cycle must implement
+ * nsCycleCollectionParticipant to break cycles correctly.
+ */
+
+#ifdef __cplusplus
+
+class nsCycleCollectionParticipant;
+class nsCycleCollectingAutoRefCnt;
+
+XPCOM_API(void)
+NS_CycleCollectorSuspect3(void* aPtr, nsCycleCollectionParticipant* aCp,
+                          nsCycleCollectingAutoRefCnt* aRefCnt,
+                          bool* aShouldDelete);
+
+#endif
+
+/**
+ * Categories (in the category manager service) used by XPCOM:
+ */
+
+/**
+ * A category which is read after component registration but before
+ * the "xpcom-startup" notifications. Each category entry is treated
+ * as the contract ID of a service which implements
+ * nsIDirectoryServiceProvider. Each directory service provider is
+ * installed in the global directory service.
+ */
+#define XPCOM_DIRECTORY_PROVIDER_CATEGORY "xpcom-directory-providers"
+
+/**
+ * A category which is read after component registration but before
+ * NS_InitXPCOM returns. Each category entry is treated as the contractID of
+ * a service: each service is instantiated, and if it implements nsIObserver
+ * the nsIObserver.observe method is called with the "xpcom-startup" topic.
+ */
+#define NS_XPCOM_STARTUP_CATEGORY "xpcom-startup"
+
+/**
+ * Observer topics (in the observer service) used by XPCOM:
+ */
+
+/**
+ * At XPCOM startup after component registration is complete, the
+ * following topic is notified. In order to receive this notification,
+ * component must register their contract ID in the category manager,
+ *
+ * @see NS_XPCOM_STARTUP_CATEGORY
+ */
+#define NS_XPCOM_STARTUP_OBSERVER_ID "xpcom-startup"
+
+/**
+ * At XPCOM shutdown, this topic is notified just before "xpcom-shutdown".
+ * Components should only use this to mark themselves as 'being destroyed'.
+ * Nothing should be dispatched to any event loop.
+ */
+#define NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID "xpcom-will-shutdown"
+
+/**
+ * At XPCOM shutdown, this topic is notified. All components must
+ * release any interface references to objects in other modules when
+ * this topic is notified.
+ */
+#define NS_XPCOM_SHUTDOWN_OBSERVER_ID "xpcom-shutdown"
+
+/**
+ * This topic is notified when an entry was added to a category in the
+ * category manager. The subject of the notification will be the name of
+ * the added entry as an nsISupportsCString, and the data will be the
+ * name of the category. The notification will occur on the main thread.
+ */
+#define NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID "xpcom-category-entry-added"
+
+/**
+ * This topic is notified when an entry was removed from a category in the
+ * category manager. The subject of the notification will be the name of
+ * the removed entry as an nsISupportsCString, and the data will be the
+ * name of the category. The notification will occur on the main thread.
+ */
+#define NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID \
+  "xpcom-category-entry-removed"
+
+/**
+ * This topic is notified when an a category was cleared in the category
+ * manager. The subject of the notification will be the category manager,
+ * and the data will be the name of the cleared category.
+ * The notification will occur on the main thread.
+ */
+#define NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID "xpcom-category-cleared"
+
+XPCOM_API(nsresult) NS_GetDebug(nsIDebug2** aResult);
+
+#endif