We have a problem in the process on destroying WebContentsImpl because

chrome/browser/android/shortcut_helper.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_ANDROID_SHORTCUT_HELPER_H_
 #define CHROME_BROWSER_ANDROID_SHORTCUT_HELPER_H_
 
 #include "base/android/jni_weak_ref.h"
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
@@ skipping 39 matching lines @@
   void OnDidRetrieveWebappInformation(bool success,
                                       bool is_mobile_webapp_capable,
                                       bool is_apple_mobile_webapp_capable,
                                       const GURL& expected_url);
 
   void FinishAddingShortcut(
       const favicon_base::FaviconBitmapResult& bitmap_result);
 
   // WebContentsObserver
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-  virtual void WebContentsDestroyed(content::WebContents* web_contents)
-      OVERRIDE;
+  virtual void WebContentsDestroyed() OVERRIDE;
 
  private:
   void Destroy();
 
   GURL url_;
   base::string16 title_;
   int launcher_large_icon_size_;
   ShortcutType shortcut_type_;
   base::CancelableTaskTracker cancelable_task_tracker_;
 
@@ skipping 16 matching lines @@
       const favicon_base::FaviconBitmapResult& bitmap_result);
 
   // Registers JNI hooks.
   static bool RegisterShortcutHelper(JNIEnv* env);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShortcutHelper);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_SHORTCUT_HELPER_H_