Make avatar menu bubble as singleton and destroy all the menu items and menu model when bubble cl...

chrome/browser/ui/gtk/avatar_menu_bubble_gtk.h

 // Copyright (c) 2011 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_UI_GTK_AVATAR_MENU_BUBBLE_GTK_H_
 #define CHROME_BROWSER_UI_GTK_AVATAR_MENU_BUBBLE_GTK_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 30 matching lines @@
   // AvatarMenuModelObserver implementation.
   virtual void OnAvatarMenuModelChanged(
       AvatarMenuModel* avatar_menu_model) OVERRIDE;
 
   // AvatarMenuItemGtk::Delegate implementation.
   virtual void OpenProfile(size_t profile_index);
 
   virtual void EditProfile(size_t profile_index);
 
  private:
+  // Notified when |contents_| is destroyed so we can delete our instance.
+  CHROMEGTK_CALLBACK_0(AvatarMenuBubbleGtk, void, OnDestroy);
   CHROMEGTK_CALLBACK_1(AvatarMenuBubbleGtk, void, OnSizeRequest,
                        GtkRequisition*);
   CHROMEGTK_CALLBACK_0(AvatarMenuBubbleGtk, void, OnNewProfileLinkClicked);
 
   // Create all widgets in this bubble.
   void InitContents();
 
   // A model of all the profile information to be displayed in the menu.
   scoped_ptr<AvatarMenuModel> avatar_menu_model_;
 
@@ skipping 10 matching lines @@
   std::vector<AvatarMenuItemGtk*> items_;
 
   // The minimum width to display the bubble. This is used to prevent the bubble
   // from automatically reducing its size when hovering over a profile item.
   int minimum_width_;
 
   DISALLOW_COPY_AND_ASSIGN(AvatarMenuBubbleGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_AVATAR_MENU_BUBBLE_GTK_H_