We have a problem in the process on destroying WebContentsImpl because

chrome/browser/ui/views/translate/translate_bubble_view.h

 // Copyright 2013 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_UI_VIEWS_TRANSLATE_TRANSLATE_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_TRANSLATE_TRANSLATE_BUBBLE_VIEW_H_
 
 #include <map>
 #include <string>
 
@@ skipping 52 matching lines @@
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
 
   // views::CombboxListener methods.
   virtual void OnPerformAction(views::Combobox* combobox) OVERRIDE;
 
   // views::LinkListener method.
   virtual void LinkClicked(views::Link* source, int event_flags) OVERRIDE;
 
   // content::WebContentsObserver method.
-  virtual void WebContentsDestroyed(content::WebContents* web_contents)
-      OVERRIDE;
+  virtual void WebContentsDestroyed() OVERRIDE;
 
   // Returns the current view state.
   TranslateBubbleModel::ViewState GetViewState() const;
 
  private:
   enum LinkID {
     LINK_ID_ADVANCED,
     LINK_ID_LANGUAGE_SETTINGS,
   };
 
@@ skipping 107 matching lines @@
   // Whether the translation is acutually executed.
   bool translate_executed_;
 
   // Whether one of denial buttons is clicked.
   bool denial_button_clicked_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateBubbleView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TRANSLATE_TRANSLATE_BUBBLE_VIEW_H_