ChromeFrame tabs would hang at times while closing. This would randomly occur...

chrome/browser/external_tab_container_win.h

 // Copyright (c) 2010 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 CHROME_BROWSER_EXTERNAL_TAB_CONTAINER_WIN_H_
 #define CHROME_BROWSER_EXTERNAL_TAB_CONTAINER_WIN_H_
 
 #include <vector>
 #include <map>
 #include "base/lazy_instance.h"
@@ skipping 188 matching lines @@
     pending_ = pending;
   }
 
   // InfoBarContainer::Delegate overrides
   virtual void InfoBarSizeChanged(bool is_animating);
 
   virtual void TabContentsCreated(TabContents* new_contents);
 
   virtual bool infobars_enabled();
 
+  void RunUnloadHandlers(gfx::NativeWindow notification_window,
+                         int notification_message);
+
  protected:
   // Overridden from views::WidgetWin:
   virtual LRESULT OnCreate(LPCREATESTRUCT create_struct);
   virtual void OnDestroy();
   virtual void OnFinalMessage(HWND window);
 
   bool InitNavigationInfo(IPC::NavigationInfo* nav_info,
                           NavigationType::Type nav_type,
                           int relative_offset);
   void Navigate(const GURL& url, const GURL& referrer);
@@ skipping 87 matching lines @@
   scoped_refptr<ChromeURLRequestContextGetter> request_context_;
 
   UnhandledKeyboardEventHandler unhandled_keyboard_event_handler_;
 
   // A mapping between accelerators and commands.
   std::map<views::Accelerator, int> accelerator_table_;
 
   // Set to true if the tab is waiting for the unload event to complete.
   bool waiting_for_unload_event_;
 
-  // Pointer to the innermost ExternalTabContainer instance which is waiting
-  // for the unload event listeners to finish.
-  // Used to maintain a local global stack of containers.
-  static ExternalTabContainer* innermost_tab_for_unload_event_;
-
   // Contains the list of URL requests which are pending waiting for an ack
   // from the external host.
   std::vector<PendingTopLevelNavigation> pending_open_url_requests_;
 
   // Set to true if the ExternalTabContainer instance is waiting for an ack
   // from the host.
   bool pending_;
 
   // Set to true if the ExternalTabContainer if infobars should be enabled.
   bool infobars_enabled_;
 
   views::FocusManager* focus_manager_;
 
   views::View* external_tab_view_;
 
+  gfx::NativeWindow notification_window_;
+  int notification_message_;
+
   DISALLOW_COPY_AND_ASSIGN(ExternalTabContainer);
 };
 
 #endif  // CHROME_BROWSER_EXTERNAL_TAB_CONTAINER_WIN_H_