Revert of Remove about:srcdoc url conversion.

chrome/browser/prerender/prerender_tab_helper.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_TAB_HELPER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 17 matching lines @@
  public:
   ~PrerenderTabHelper() override;
 
   // content::WebContentsObserver implementation.
   void DidGetRedirectForResourceRequest(
       const content::ResourceRedirectDetails& details) override;
   void DidStopLoading() 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 DidCommitProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
       const GURL& validated_url,
       ui::PageTransition transition_type) override;
 
   // Called when the URL of the main frame changed, either when the load
   // commits, or a redirect happens.
   void MainFrameUrlDidChange(const GURL& url);
 
   // Called when this prerendered WebContents has just been swapped in.
@@ skipping 51 matching lines @@
   GURL url_;
 
   base::WeakPtrFactory<PrerenderTabHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderTabHelper);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_