Revert of Remove about:srcdoc url conversion.

content/public/browser/web_contents_observer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 182 matching lines @@
   // SOON TO BE DEPRECATED. Use DidStartNavigation instead in PlzNavigate. In
   // default mode, it is still necessary to override this function to be
   // notified about a navigation earlier than DidStartProvisionalLoad. This
   // function will be removed when PlzNavigate is enabled.
   virtual void DidStartNavigationToPendingEntry(const GURL& url,
                                                 ReloadType reload_type) {}
 
   // |render_frame_host| is the RenderFrameHost for which the provisional load
   // is happening.
   //
-  // Since the URL validation will strip error URLs, the boolean flag
-  // |is_error_page| will indicate that the not validated URL was an error page.
+  // Since the URL validation will strip error URLs, or srcdoc URLs, the boolean
+  // flags |is_error_page| and |is_iframe_srcdoc| will indicate that the not
+  // validated URL was either an error page or an iframe srcdoc.
   //
   // Note that during a cross-process navigation, several provisional loads
   // can be on-going in parallel.
   //
   // DEPRECATED. Use DidStartNavigation instead in all cases.
   virtual void DidStartProvisionalLoadForFrame(
       RenderFrameHost* render_frame_host,
       const GURL& validated_url,
-      bool is_error_page) {}
+      bool is_error_page,
+      bool is_iframe_srcdoc) {}
 
   // This method is invoked when the provisional load was successfully
   // committed.
   //
   // If the navigation only changed the reference fragment, or was triggered
   // using the history API (e.g. window.history.replaceState), we will receive
   // this signal without a prior DidStartProvisionalLoadForFrame signal.
   //
   // DEPRECATED. Use DidFinishNavigation instead in all cases.
   virtual void DidCommitProvisionalLoadForFrame(
@@ skipping 287 matching lines @@
   void ResetWebContents();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_