We have a problem in the process on destroying WebContentsImpl because

chrome/browser/ui/blocked_content/popup_blocker_browsertest.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 "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 64 matching lines @@
 
 class CloseObserver : public content::WebContentsObserver {
  public:
   explicit CloseObserver(WebContents* contents)
       : content::WebContentsObserver(contents) {}
 
   void Wait() {
     close_loop_.Run();
   }
 
-  virtual void WebContentsDestroyed(WebContents* contents) OVERRIDE {
+  virtual void WebContentsDestroyed() OVERRIDE {
     close_loop_.Quit();
   }
 
  private:
   base::RunLoop close_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(CloseObserver);
 };
 
 class PopupBlockerBrowserTest : public InProcessBrowserTest {
@@ skipping 376 matching lines @@
 
 // Verify that the renderer can't DOS the browser by creating arbitrarily many
 // popups.
 IN_PROC_BROWSER_TEST_F(PopupBlockerBrowserTest, DenialOfService) {
   GURL url(embedded_test_server()->GetURL("/popup_blocker/popup-dos.html"));
   ui_test_utils::NavigateToURL(browser(), url);
   ASSERT_EQ(25, GetBlockedContentsCount());
 }
 
 }  // namespace