GTK: own a widget that was being accessed after destruction.

chrome/browser/gtk/browser_toolbar_gtk.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_GTK_BROWSER_TOOLBAR_GTK_H_
 #define CHROME_BROWSER_GTK_BROWSER_TOOLBAR_GTK_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
@@ skipping 212 matching lines @@
   // All the buttons in the toolbar.
   scoped_ptr<BackForwardButtonGtk> back_, forward_;
   scoped_ptr<CustomDrawButton> home_;
   scoped_ptr<ReloadButtonGtk> reload_;
   scoped_ptr<BrowserActionsToolbarGtk> actions_toolbar_;
   OwnedWidgetGtk page_menu_button_, app_menu_button_;
 
   // Keep a pointer to the menu button images because we change them when
   // the theme changes.
   GtkWidget* page_menu_image_;
-  GtkWidget* app_menu_image_;
+  OwnedWidgetGtk app_menu_image_;
 
   // The model that contains the security level, text, icon to display...
   ToolbarModel* model_;
 
   GtkThemeProvider* theme_provider_;
 
   scoped_ptr<MenuGtk> page_menu_;
   scoped_ptr<MenuGtk> app_menu_;
 
   PageMenuModel page_menu_model_;
@@ skipping 24 matching lines @@
 
   ThrobAnimation upgrade_reminder_animation_;
 
   // When collapsed, the toolbar is just a tiny strip, no controls are visible.
   bool collapsed_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserToolbarGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_BROWSER_TOOLBAR_GTK_H_