We have a problem in the process on destroying WebContentsImpl because

content/public/test/browser_test_utils.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_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 #define CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 
 #include <queue>
 #include <string>
 #include <vector>
@@ skipping 205 matching lines @@
 class WebContentsDestroyedWatcher : public WebContentsObserver {
  public:
   explicit WebContentsDestroyedWatcher(WebContents* web_contents);
   virtual ~WebContentsDestroyedWatcher();
 
   // Waits until the WebContents is destroyed.
   void Wait();
 
  private:
   // Overridden WebContentsObserver methods.
-  virtual void WebContentsDestroyed(WebContents* web_contents) OVERRIDE;
+  virtual void WebContentsDestroyed() OVERRIDE;
 
   scoped_refptr<MessageLoopRunner> message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsDestroyedWatcher);
 };
 
 // Watches a RenderProcessHost and waits for specified destruction events.
 class RenderProcessHostWatcher : public RenderProcessHostObserver {
  public:
   enum WatchType {
@@ skipping 52 matching lines @@
   NotificationRegistrar registrar_;
   std::queue<std::string> message_queue_;
   scoped_refptr<MessageLoopRunner> message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(DOMMessageQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_