Revert of Remove about:srcdoc url conversion.

chrome/browser/prerender/prerender_contents.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 CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 152 matching lines @@
       const content::SessionStorageNamespace* session_storage_namespace) const;
 
   // content::WebContentsObserver implementation.
   void RenderFrameCreated(content::RenderFrameHost* render_frame_host) override;
   void DidStopLoading() override;
   void DocumentLoadedInFrame(
       content::RenderFrameHost* render_frame_host) override;
   void DidStartProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
       const GURL& validated_url,
-      bool is_error_page) override;
+      bool is_error_page,
+      bool is_iframe_srcdoc) override;
   void DidFinishLoad(content::RenderFrameHost* render_frame_host,
                      const GURL& validated_url) override;
   void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
   void DidGetRedirectForResourceRequest(
       const content::ResourceRedirectDetails& details) override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   void RenderProcessGone(base::TerminationStatus status) override;
@@ skipping 181 matching lines @@
   // A running tally of the number of bytes this prerender has caused to be
   // transferred over the network for resources.  Updated with AddNetworkBytes.
   int64_t network_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderContents);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_