Add OVERRIDE to chrome/browser/.

chrome/browser/tabs/pinned_tab_service.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_TABS_PINNED_TAB_SERVICE_H_
 #define CHROME_BROWSER_TABS_PINNED_TAB_SERVICE_H_
 #pragma once
 
+#include "base/compiler_specific.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 // PinnedTabService is responsible for updating preferences with the set of
 // pinned tabs to restore at startup. PinnedTabService listens for the
 // appropriate set of notifications to know it should update preferences.
 class PinnedTabService : public content::NotificationObserver,
                          public ProfileKeyedService {
  public:
   explicit PinnedTabService(Profile* profile);
 
  private:
   // Invoked when we're about to exit.
   void GotExit();
 
   // content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   Profile* profile_;
 
   // If true we've seen an exit event (or the last browser is closing which
   // triggers an exit) and can ignore all other events.
   bool got_exiting_;
 
   // True if there is at least one normal browser for our profile.
   bool has_normal_browser_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(PinnedTabService);
 };
 
 #endif  // CHROME_BROWSER_TABS_PINNED_TAB_SERVICE_H_