Virtual destructors should have virtual keyword.

chrome/browser/tab_contents/render_view_context_menu_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_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_GTK_H_
 #define CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_GTK_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 #include "chrome/browser/ui/gtk/menu_gtk.h"
 #include "ui/gfx/point.h"
 
 struct ContextMenuParams;
 
 class RenderViewContextMenuGtk : public RenderViewContextMenu,
                                  public MenuGtk::Delegate {
  public:
   RenderViewContextMenuGtk(TabContents* web_contents,
                            const ContextMenuParams& params,
                            uint32_t triggering_event_time);
 
-  ~RenderViewContextMenuGtk();
+  virtual ~RenderViewContextMenuGtk();
 
   // Show the menu at the given location.
   void Popup(const gfx::Point& point);
 
   // Menu::Delegate implementation ---------------------------------------------
   virtual bool AlwaysShowIconForCmd(int command_id) const;
 
  protected:
   // RenderViewContextMenu implementation --------------------------------------
   virtual void PlatformInit();
   // TODO(port): implement.
   virtual bool GetAcceleratorForCommandId(
       int command_id,
       ui::Accelerator* accelerator);
 
  private:
   scoped_ptr<MenuGtk> menu_gtk_;
   uint32_t triggering_event_time_;
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_GTK_H_