Devirtualize CHROMEGTK_CALLBACK.

chrome/browser/ui/gtk/menu_bar_helper.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.
 //
 // This class replicates some menubar behaviors that are tricky to get right.
 // It is used to create a more native feel for the bookmark bar.
 
 #ifndef CHROME_BROWSER_UI_GTK_MENU_BAR_HELPER_H_
 #define CHROME_BROWSER_UI_GTK_MENU_BAR_HELPER_H_
 #pragma once
@@ skipping 16 matching lines @@
     virtual ~Delegate() {}
 
     // Called when a the menu for a button ought to be triggered.
     virtual void PopupForButton(GtkWidget* button) = 0;
     virtual void PopupForButtonNextTo(GtkWidget* button,
                                       GtkMenuDirectionType dir) = 0;
   };
 
   // |delegate| cannot be null.
   explicit MenuBarHelper(Delegate* delegate);
-  virtual ~MenuBarHelper();
+  ~MenuBarHelper();
 
   // Must be called whenever a button's menu starts showing. It triggers the
   // MenuBarHelper to start listening for certain events.
   void MenuStartedShowing(GtkWidget* button, GtkWidget* menu);
 
   // Add |button| to the set of buttons we care about.
   void Add(GtkWidget* button);
 
   // Remove |button| from the set of buttons we care about.
   void Remove(GtkWidget* button);
@@ skipping 23 matching lines @@
   std::vector<GtkWidget*> submenus_;
 
   // Signal handlers that are attached only between the "show" and "hide" events
   // for the menu.
   scoped_ptr<ui::GtkSignalRegistrar> signal_handlers_;
 
   Delegate* delegate_;
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_MENU_BAR_HELPER_H_