Add OVERRIDE to chrome/browser/.

chrome/browser/notifications/desktop_notification_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_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_
 #define CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 61 matching lines @@
                                  int route_id,
                                  int notification_id);
 
   // Methods to setup and modify permission preferences.
   void GrantPermission(const GURL& origin);
   void DenyPermission(const GURL& origin);
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   // Creates a data:xxxx URL which contains the full HTML for a notification
   // using supplied icon, title, and text, run through a template which contains
   // the standard formatting for notifications.
   static string16 CreateDataUrl(const GURL& icon_url,
                                 const string16& title,
                                 const string16& body,
                                 WebKit::WebTextDirection dir);
 
   // Creates a data:xxxx URL which contains the full HTML for a notification
@@ skipping 51 matching lines @@
   // Non-owned pointer to the notification manager which manages the
   // UI for desktop toasts.
   NotificationUIManager* ui_manager_;
 
   content::NotificationRegistrar notification_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopNotificationService);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_