Move most of the remaining users of WebContentsObserver::tab_contents() to use web_contents().

chrome/browser/prerender/prerender_contents.h

 // Copyright (c) 2011 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_
 #pragma once
 
 #include <list>
 #include <string>
@@ skipping 205 matching lines @@
 
   // Needs to be able to call the constructor.
   friend class PrerenderContentsFactoryImpl;
 
   friend class PrerenderRenderViewHostObserver;
 
   // Message handlers.
   void OnUpdateFaviconURL(int32 page_id, const std::vector<FaviconURL>& urls);
 
   // Returns the RenderViewHost Delegate for this prerender.
-  RenderViewHostDelegate* GetRenderViewHostDelegate();
+  content::WebContents* GetWebContents();
 
   // Returns the ProcessMetrics for the render process, if it exists.
   base::ProcessMetrics* MaybeGetProcessMetrics();
 
   // The prerender manager owning this object.
   PrerenderManager* prerender_manager_;
 
   // The prerender tracker tracking prerenders.
   PrerenderTracker* prerender_tracker_;
 
@@ skipping 68 matching lines @@
 
   // Offset by which to offset prerendered pages
   static const int32 kPrerenderPageIdOffset = 10;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderContents);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_