Ensure that MenuGtks are destroyed before their accelerator group.

chrome/browser/gtk/menu_gtk.h

 // Copyright (c) 2009 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_MENU_GTK_H_
 #define CHROME_BROWSER_GTK_MENU_GTK_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
@@ skipping 42 matching lines @@
   // Displays the menu using the button type and timestamp of |event|. The popup
   // is statically positioned at |widget|.
   void Popup(GtkWidget* widget, GdkEvent* event);
 
   // Displays the menu as a context menu, i.e. at the current cursor location.
   void PopupAsContext();
 
  private:
   // A recursive function that transforms a MenuCreateMaterial tree into a set
   // of GtkMenuItems.
-  void BuildMenuIn(GtkWidget* menu, const MenuCreateMaterial* menu_data);
+  void BuildMenuIn(GtkWidget* menu,
+                   const MenuCreateMaterial* menu_data,
+                   GtkAccelGroup* accel_group);
 
   // A function that creates a GtkMenu from |delegate_|. This function is not
   // recursive and does not support sub-menus.
   void BuildMenuFromDelegate();
 
   // Callback for when a menu item is clicked. Used when the menu is created
   // via a MenuCreateMaterial.
   static void OnMenuItemActivated(GtkMenuItem* menuitem, MenuGtk* menu);
 
   // Callback for when a menu item is clicked. Used when the menu is created
@@ skipping 10 matching lines @@
                                int* y,
                                gboolean* push_in,
                                void* void_widget);
 
   // Sets the check mark and enabled/disabled state on our menu items.
   static void SetMenuItemInfo(GtkWidget* widget, void* raw_menu);
 
   // Queries this object about the menu state.
   MenuGtk::Delegate* delegate_;
 
-  // Accelerator group to add keyboard accelerators to.
-  GtkAccelGroup* accel_group_;
-
   // gtk_menu_popup() does not appear to take ownership of popup menus, so
   // MenuGtk explicitly manages the lifetime of the menu.
   OwnedWidgetGtk menu_;
 };
 
 #endif  // CHROME_BROWSER_GTK_MENU_GTK_H_