We have a problem in the process on destroying WebContentsImpl because

chrome/browser/ui/webui/constrained_web_dialog_ui_browsertest.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 "base/strings/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/webui/constrained_web_dialog_ui.h"
 #include "chrome/common/url_constants.h"
@@ skipping 15 matching lines @@
  public:
   explicit ConstrainedWebDialogBrowserTestObserver(WebContents* contents)
       : content::WebContentsObserver(contents),
         contents_destroyed_(false) {
   }
   virtual ~ConstrainedWebDialogBrowserTestObserver() {}
 
   bool contents_destroyed() { return contents_destroyed_; }
 
  private:
-  virtual void WebContentsDestroyed(WebContents* tab) OVERRIDE {
+  virtual void WebContentsDestroyed() OVERRIDE {
     contents_destroyed_ = true;
   }
 
   bool contents_destroyed_;
 };
 
 }  // namespace
 
 class ConstrainedWebDialogBrowserTest : public InProcessBrowserTest {
  public:
@@ skipping 48 matching lines @@
 
   ConstrainedWebDialogBrowserTestObserver observer(new_tab.get());
   dialog_delegate->ReleaseWebContentsOnDialogClose();
   dialog_delegate->OnDialogCloseFromWebUI();
 
   ASSERT_FALSE(observer.contents_destroyed());
   EXPECT_FALSE(IsShowingWebContentsModalDialog(web_contents));
   new_tab.reset();
   EXPECT_TRUE(observer.contents_destroyed());
 }