Add OVERRIDE to chrome/browser/.

chrome/browser/history/top_sites.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_HISTORY_TOP_SITES_H_
 #define CHROME_BROWSER_HISTORY_TOP_SITES_H_
 #pragma once
 
 #include <list>
 #include <set>
@@ skipping 277 matching lines @@
 
   // Executes all of the callbacks in |pending_callbacks|. This is used after
   // we finish loading if any requests came in before we loaded.
   static void ProcessPendingCallbacks(
       const PendingCallbackSet& pending_callbacks,
       const MostVisitedURLList& urls);
 
   // Implementation of content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   // Resets top_sites_ and updates the db (in the background). All mutations to
   // top_sites_ *must* go through this.
   void SetTopSites(const MostVisitedURLList& new_top_sites);
 
   // Returns the number of most visted results to request from history. This
   // changes depending upon how many urls have been blacklisted.
   int num_results_to_request_from_history() const;
 
   // Invoked when transitioning to LOADED. Notifies any queued up callbacks.
@@ skipping 89 matching lines @@
   bool loaded_;
 
   DISALLOW_COPY_AND_ASSIGN(TopSites);
 };
 
 extern const TopSites::PrepopulatedPage kPrepopulatedPages[2];
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_TOP_SITES_H_