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

chrome/browser/ui/gtk/bookmarks/bookmark_bar_instructions_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_BOOKMARKS_BOOKMARK_BAR_INSTRUCTIONS_GTK_H_
 #define CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_BAR_INSTRUCTIONS_GTK_H_
 #pragma once
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/gtk/gtk_signal.h"
 
 typedef struct _GtkWidget GtkWidget;
 class GtkThemeService;
 class Profile;
 
 class BookmarkBarInstructionsGtk : public content::NotificationObserver {
  public:
   // The delegate is notified once the user clicks on the link to import
   // bookmarks.
   class Delegate {
    public:
     virtual void ShowImportDialog() = 0;
 
    protected:
     virtual ~Delegate() {}
   };
 
   BookmarkBarInstructionsGtk(Delegate* delegate, Profile* profile);
 
   // Get the native widget.
   GtkWidget* widget() const { return instructions_hbox_; }
 
  private:
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   CHROMEGTK_CALLBACK_0(BookmarkBarInstructionsGtk, void, OnButtonClick);
 
   // Sets the correct color for |instructions_label_| and |instructions_link_|.
   void UpdateColors();
 
   Delegate* delegate_;
 
   Profile* profile_;
 
   GtkThemeService* theme_service_;
 
   // HBox that holds the the label and link of bookmark bar import promotion.
   GtkWidget* instructions_hbox_;
   GtkWidget* instructions_label_;
   GtkWidget* instructions_link_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkBarInstructionsGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_BAR_INSTRUCTIONS_GTK_H_