Add OVERRIDE to content/.

content/browser/host_zoom_map.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.
 
 // Maps hostnames to custom zoom levels.  Written on the UI thread and read on
 // any thread.  One instance per browser context.
 
 #ifndef CONTENT_BROWSER_HOST_ZOOM_MAP_H_
 #define CONTENT_BROWSER_HOST_ZOOM_MAP_H_
 #pragma once
@@ skipping 51 matching lines @@
   // tab.
   //
   // This should only be called on the UI thread.
   void SetTemporaryZoomLevel(int render_process_id,
                              int render_view_id,
                              double level);
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   double default_zoom_level() const { return default_zoom_level_; }
   void set_default_zoom_level(double level) { default_zoom_level_ = level; }
 
   HostZoomMap* GetOriginal() const { return original_; }
 
  private:
   friend class base::RefCountedThreadSafe<
       HostZoomMap, content::BrowserThread::DeleteOnUIThread>;
   friend struct content::BrowserThread::DeleteOnThread<
@@ skipping 25 matching lines @@
   // Used around accesses to |host_zoom_levels_|, |default_zoom_level_| and
   // |temporary_zoom_levels_| to guarantee thread safety.
   mutable base::Lock lock_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(HostZoomMap);
 };
 
 #endif  // CONTENT_BROWSER_HOST_ZOOM_MAP_H_