We have a problem in the process on destroying WebContentsImpl because

chrome/browser/ui/autofill/tab_autofill_manager_delegate.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_UI_AUTOFILL_TAB_AUTOFILL_MANAGER_DELEGATE_H_
 #define CHROME_BROWSER_UI_AUTOFILL_TAB_AUTOFILL_MANAGER_DELEGATE_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/i18n/rtl.h"
@@ skipping 52 matching lines @@
       const std::vector<base::string16>& labels) OVERRIDE;
   virtual void HideAutofillPopup() OVERRIDE;
   virtual bool IsAutocompleteEnabled() OVERRIDE;
   virtual void DetectAccountCreationForms(
       const std::vector<autofill::FormStructure*>& forms) OVERRIDE;
   virtual void DidFillOrPreviewField(
       const base::string16& autofilled_value,
       const base::string16& profile_full_name) OVERRIDE;
 
   // content::WebContentsObserver implementation.
-  virtual void WebContentsDestroyed(
-      content::WebContents* web_contents) OVERRIDE;
+  virtual void WebContentsDestroyed() OVERRIDE;
 
   // Exposed for testing.
   AutofillDialogController* GetDialogControllerForTesting() {
     return dialog_controller_.get();
   }
   void SetDialogControllerForTesting(
       const base::WeakPtr<AutofillDialogController>& dialog_controller) {
     dialog_controller_ = dialog_controller;
   }
 
  private:
   explicit TabAutofillManagerDelegate(content::WebContents* web_contents);
   friend class content::WebContentsUserData<TabAutofillManagerDelegate>;
 
   content::WebContents* const web_contents_;
   base::WeakPtr<AutofillDialogController> dialog_controller_;
   base::WeakPtr<AutofillPopupControllerImpl> popup_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(TabAutofillManagerDelegate);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_AUTOFILL_TAB_AUTOFILL_MANAGER_DELEGATE_H_