Revert my change to get the tree green. Not sure why the tests became flaky....

chrome/browser/renderer_host/render_view_host.h

 // Copyright (c) 2006-2008 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_RENDERER_HOST_RENDER_VIEW_HOST_H__
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H__
 
 #include <string>
 #include <vector>
 
@@ skipping 418 matching lines @@
   void OnMsgShowWidget(int route_id, const gfx::Rect& initial_pos);
   void OnMsgRunModal(IPC::Message* reply_msg);
   void OnMsgRendererReady();
   void OnMsgRendererGone();
   void OnMsgNavigate(const IPC::Message& msg);
   void OnMsgUpdateState(int32 page_id,
                         const std::string& state);
   void OnMsgUpdateTitle(int32 page_id, const std::wstring& title);
   void OnMsgUpdateEncoding(const std::wstring& encoding);
   void OnMsgUpdateTargetURL(int32 page_id, const GURL& url);
-  void OnMsgThumbnail(const GURL& url,
-                      const ThumbnailScore& score,
-                      const SkBitmap& bitmap);
+  void OnMsgThumbnail(const IPC::Message& msg);
   void OnMsgClose();
   void OnMsgRequestMove(const gfx::Rect& pos);
   void OnMsgDidRedirectProvisionalLoad(int32 page_id,
                                        const GURL& source_url,
                                        const GURL& target_url);
   void OnMsgDidStartLoading(int32 page_id);
   void OnMsgDidStopLoading(int32 page_id);
   void OnMsgDidLoadResourceFromMemoryCache(const GURL& url,
                                            const std::string& security_info);
   void OnMsgDidStartProvisionalLoadForFrame(bool main_frame,
@@ skipping 167 matching lines @@
   virtual ~RenderViewHostFactory() {}
 
   virtual RenderViewHost* CreateRenderViewHost(
       SiteInstance* instance,
       RenderViewHostDelegate* delegate,
       int routing_id,
       base::WaitableEvent* modal_dialog_event) = 0;
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H__