Fixes possible crash if the window hosting a menu was closed while the

views/controls/button/menu_button.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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 VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_
 #define VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_
 
 #include <string>
 
 #include "base/time.h"
 #include "gfx/font.h"
@@ skipping 78 matching lines @@
   // The associated menu's resource identifier.
   ViewMenuDelegate* menu_delegate_;
 
   // Whether or not we're showing a drop marker.
   bool show_menu_marker_;
 
   // The down arrow used to differentiate the menu button from normal
   // text buttons.
   const SkBitmap* menu_marker_;
 
+  // If non-null the destuctor sets this to true. This is set while the menu is
+  // showing and used to detect if the menu was deleted while running.
+  bool* destroyed_flag_;
+
   DISALLOW_COPY_AND_ASSIGN(MenuButton);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_