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diff --git a/dom/base/nsSyncLoadService.h b/dom/base/nsSyncLoadService.h
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+++ b/dom/base/nsSyncLoadService.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/. */
+
+/*
+ * A service that provides methods for synchronously loading a DOM in various
+ * ways.
+ */
+
+#ifndef nsSyncLoadService_h__
+#define nsSyncLoadService_h__
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "nscore.h"
+#include "nsIContentPolicy.h"
+#include "nsILoadInfo.h"
+#include "nsIReferrerInfo.h"
+
+class nsICookieJarSettings;
+class nsIInputStream;
+class nsILoadGroup;
+class nsIStreamListener;
+class nsIURI;
+class nsIPrincipal;
+class nsIChannel;
+
+namespace mozilla::dom {
+class Document;
+}  // namespace mozilla::dom
+
+class nsSyncLoadService {
+ public:
+  /**
+   * Synchronously load the document from the specified URI.
+   *
+   * @param aURI URI to load the document from.
+   * @param aContentPolicyType contentPolicyType to be set on the channel
+   * @param aLoaderPrincipal Principal of loading document. For security
+   *                         checks and referrer header.
+   * @param aSecurityFlags securityFlags to be set on the channel
+   * @param aLoadGroup The loadgroup to use for loading the document.
+   * @param aForceToXML Whether to parse the document as XML, regardless of
+   *                    content type.
+   * @param referrerPolicy Referrer policy.
+   * @param aResult [out] The document loaded from the URI.
+   */
+  static nsresult LoadDocument(
+      nsIURI* aURI, nsContentPolicyType aContentPolicyType,
+      nsIPrincipal* aLoaderPrincipal, nsSecurityFlags aSecurityFlags,
+      nsILoadGroup* aLoadGroup, nsICookieJarSettings* aCookieJarSettings,
+      bool aForceToXML, mozilla::dom::ReferrerPolicy aReferrerPolicy,
+      mozilla::dom::Document** aResult);
+
+  /**
+   * Read input stream aIn in chunks and deliver synchronously to aListener.
+   *
+   * @param aIn The stream to be read. The ownership of this stream is taken.
+   * @param aListener The listener that will receive
+   *                  OnStartRequest/OnDataAvailable/OnStopRequest
+   *                  notifications.
+   * @param aChannel The channel that aIn was opened from.
+   */
+  static nsresult PushSyncStreamToListener(already_AddRefed<nsIInputStream> aIn,
+                                           nsIStreamListener* aListener,
+                                           nsIChannel* aChannel);
+};
+
+#endif  // nsSyncLoadService_h__