Revert of Remove about:srcdoc url conversion.

content/browser/frame_host/navigator_delegate.h

 // Copyright 2013 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_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 
 #include "base/memory/scoped_vector.h"
 #include "base/strings/string16.h"
 #include "content/public/browser/invalidate_type.h"
@@ skipping 32 matching lines @@
   // Called when the navigation finished: it was either committed or canceled
   // before commit.  Note that |navigation_handle| will be destroyed at the end
   // of this call.
   virtual void DidFinishNavigation(NavigationHandle* navigation_handle) {}
 
   // TODO(clamy): all methods below that are related to navigation
   // events should go away in favor of the ones above.
 
   // The RenderFrameHost started a provisional load for the frame
   // represented by |render_frame_host|.
-  virtual void DidStartProvisionalLoad(RenderFrameHostImpl* render_frame_host,
-                                       const GURL& validated_url,
-                                       bool is_error_page) {}
+  virtual void DidStartProvisionalLoad(
+      RenderFrameHostImpl* render_frame_host,
+      const GURL& validated_url,
+      bool is_error_page,
+      bool is_iframe_srcdoc) {}
 
   // A provisional load in |render_frame_host| failed.
   virtual void DidFailProvisionalLoadWithError(
       RenderFrameHostImpl* render_frame_host,
       const GURL& validated_url,
       int error_code,
       const base::string16& error_description,
       bool was_ignored_by_handler) {}
 
   // Document load in |render_frame_host| failed.
@@ skipping 78 matching lines @@
   // wants to see passed to the corresponding URLRequest on the IO thread.
   // In the case of a navigation to an interstitial, no call will be made to the
   // embedder and |nullptr| is returned.
   virtual std::unique_ptr<NavigationUIData> GetNavigationUIData(
       NavigationHandle* navigation_handle);
 };
 
 }  // namspace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_