Add RenderViewHost* to DidStartLoading and DidStopLoading in

chrome/browser/tab_contents/thumbnail_generator.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_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
 #define CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
 
 #include <map>
 #include <utility>
 #include <vector>
@@ skipping 103 matching lines @@
   void UpdateThumbnail(content::WebContents* web_contents,
                        const SkBitmap& bitmap,
                        const ThumbnailGenerator::ClipResult& clip_result);
 
   // Returns true if we should update the thumbnail of the given URL.
   static bool ShouldUpdateThumbnail(Profile* profile,
                                     history::TopSites* top_sites,
                                     const GURL& url);
 
   // content::WebContentsObserver overrides.
-  virtual void DidStartLoading() OVERRIDE;
+  virtual void DidStartLoading(
+      content::RenderViewHost* render_view_host) OVERRIDE;
   virtual void StopNavigation() OVERRIDE;
 
  private:
   virtual void WidgetDidReceivePaintAtSizeAck(
       content::RenderWidgetHost* widget,
       int tag,
       const gfx::Size& size);
 
   // Asynchronously updates the thumbnail of the given tab. The caller must
   // ensure that |web_contents| outlives ThumbnailGenerator so that the
@@ skipping 36 matching lines @@
   ThumbnailCallbackMap callback_map_;
 
   bool load_interrupted_;
 
   base::WeakPtrFactory<ThumbnailGenerator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThumbnailGenerator);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_