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

views/controls/button/menu_button.h

Index: views/controls/button/menu_button.h
diff --git a/views/controls/button/menu_button.h b/views/controls/button/menu_button.h
index 3895b03d4aff18a38d631616c3d2e1f898315211..c4e95e483a75edc2937d9ff8a01e8d77a301fdb3 100644
--- a/views/controls/button/menu_button.h
+++ b/views/controls/button/menu_button.h
@@ -1,4 +1,4 @@
-// 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.
 
@@ -97,6 +97,10 @@ class MenuButton : public TextButton {
   // 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);
 };