We have a problem in the process on destroying WebContentsImpl because

content/shell/browser/webkit_test_controller.cc

 // 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.
 
 #include "content/shell/browser/webkit_test_controller.h"
 
 #include <iostream>
 
 #include "base/base64.h"
 #include "base/command_line.h"
@@ skipping 404 matching lines @@
   DCHECK(CalledOnValidThread());
   if (current_pid_ != base::kNullProcessId) {
     printer_->AddErrorMessage(std::string("#CRASHED - renderer (pid ") +
                               base::IntToString(current_pid_) + ")");
   } else {
     printer_->AddErrorMessage("#CRASHED - renderer");
   }
   DiscardMainWindow();
 }
 
-void WebKitTestController::WebContentsDestroyed(WebContents* web_contents) {
+void WebKitTestController::WebContentsDestroyed() {
   DCHECK(CalledOnValidThread());
   printer_->AddErrorMessage("FAIL: main window was destroyed");
   DiscardMainWindow();
 }
 
 void WebKitTestController::Observe(int type,
                                    const NotificationSource& source,
                                    const NotificationDetails& details) {
   DCHECK(CalledOnValidThread());
   switch (type) {
@@ skipping 236 matching lines @@
     return;
   }
 
   printer_->AddErrorMessage(
       base::StringPrintf("#LEAK - renderer pid %d (%s)", current_pid_,
                          result.detail.c_str()));
   DiscardMainWindow();
 }
 
 }  // namespace content