Add OVERRIDE to chrome/browser/ui/gtk/.

chrome/browser/ui/gtk/status_icons/status_icon_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_STATUS_ICONS_STATUS_ICON_GTK_H_
 #define CHROME_BROWSER_UI_GTK_STATUS_ICONS_STATUS_ICON_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 16 matching lines @@
   virtual void SetToolTip(const string16& tool_tip) OVERRIDE;
   virtual void DisplayBalloon(const SkBitmap& icon,
                               const string16& title,
                               const string16& contents) OVERRIDE;
 
   // Exposed for testing.
   CHROMEGTK_CALLBACK_0(StatusIconGtk, void, OnClick);
 
  protected:
   // Overridden from StatusIcon.
-  virtual void UpdatePlatformContextMenu(ui::MenuModel* menu);
+  virtual void UpdatePlatformContextMenu(ui::MenuModel* menu) OVERRIDE;
 
  private:
   // Callback invoked when user right-clicks on the status icon.
   CHROMEGTK_CALLBACK_2(StatusIconGtk, void, OnPopupMenu, guint, guint);
 
   // The currently-displayed icon for the window.
   GtkStatusIcon* icon_;
 
   // The context menu for this icon (if any).
   scoped_ptr<MenuGtk> menu_;
 
   // Notification balloon.
   DesktopNotificationBalloon notification_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusIconGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_STATUS_ICONS_STATUS_ICON_GTK_H_