Fix for 'Simple Adblock' extension crashes

content/renderer/render_view_impl.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 CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 511 matching lines @@
   // appropriate section, add it there. If not, there are some random functions
   // nearer to the top you can add it to.
 
   // Cannot use std::set unfortunately since linked_ptr<> does not support
   // operator<.
   typedef std::vector<linked_ptr<ImageResourceFetcher> >
       ImageResourceFetcherList;
 
  protected:
   // RenderWidget overrides:
+  virtual void OnClose() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void OnResize(const ViewMsg_Resize_Params& params) OVERRIDE;
   virtual void DidInitiatePaint() OVERRIDE;
   virtual void DidFlushPaint() OVERRIDE;
   virtual gfx::Vector2d GetScrollOffset() OVERRIDE;
   virtual void DidHandleKeyEvent() OVERRIDE;
   virtual bool WillHandleMouseEvent(
       const blink::WebMouseEvent& event) OVERRIDE;
   virtual bool WillHandleGestureEvent(
       const blink::WebGestureEvent& event) OVERRIDE;
@@ skipping 657 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_