We have a problem in the process on destroying WebContentsImpl because

content/public/test/browser_test_utils.cc

 // 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.
 
 #include "content/public/test/browser_test_utils.h"
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/path_service.h"
 #include "base/process/kill.h"
@@ skipping 581 matching lines @@
   EXPECT_TRUE(web_contents != NULL);
 }
 
 WebContentsDestroyedWatcher::~WebContentsDestroyedWatcher() {
 }
 
 void WebContentsDestroyedWatcher::Wait() {
   message_loop_runner_->Run();
 }
 
-void WebContentsDestroyedWatcher::WebContentsDestroyed(
-    WebContents* web_contents) {
+void WebContentsDestroyedWatcher::WebContentsDestroyed() {
   message_loop_runner_->Quit();
 }
 
 RenderProcessHostWatcher::RenderProcessHostWatcher(
     RenderProcessHost* render_process_host, WatchType type)
     : render_process_host_(render_process_host),
       type_(type),
       message_loop_runner_(new MessageLoopRunner) {
   render_process_host_->AddObserver(this);
 }
@@ skipping 60 matching lines @@
   }
   // The queue should not be empty, unless we were quit because of a timeout.
   if (message_queue_.empty())
     return false;
   *message = message_queue_.front();
   message_queue_.pop();
   return true;
 }
 
 }  // namespace content