Standardize usage of virtual/override/final in content/browser/

content/browser/renderer_host/media/media_stream_track_metrics_host.h

 // Copyright 2014 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_
 
 #include <map>
 #include <string>
 
@@ skipping 13 matching lines @@
 //
 // If the renderer process goes away without sending messages that
 // tracks were removed, this class instead infers that the tracks were
 // removed.
 class MediaStreamTrackMetricsHost
     : public BrowserMessageFilter {
  public:
   explicit MediaStreamTrackMetricsHost();
 
  protected:
-  virtual ~MediaStreamTrackMetricsHost();
+  ~MediaStreamTrackMetricsHost() override;
 
   // BrowserMessageFilter override.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   void OnAddTrack(uint64 id, bool is_audio, bool is_remote);
   void OnRemoveTrack(uint64 id);
 
   // Information for a track we're keeping in |tracks_|. |is_audio|
   // specifies whether it's an audio or video track, |is_remote|
   // specifies whether it's remote (received over a PeerConnection) or
   // local (sent over a PeerConnection). |timestamp| specifies when
   // the track was connected.
   struct TrackInfo {
     bool is_audio;
     bool is_remote;
     base::TimeTicks timestamp;
   };
 
   void ReportDuration(const TrackInfo& info);
 
   // Values are unique (per renderer) track IDs.
   typedef std::map<uint64, TrackInfo> TrackMap;
   TrackMap tracks_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_