Update remaining core classes to use OVERRIDE / FINAL when needed

Source/core/platform/mediastream/MediaStreamCenter.h

 /*
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 32 matching lines @@
 class WebMediaStreamCenter;
 class WebMediaStreamTrack;
 }
 
 namespace WebCore {
 
 class MediaStreamComponent;
 class MediaStreamDescriptor;
 class MediaStreamTrackSourcesRequest;
 
-class MediaStreamCenter : public blink::WebMediaStreamCenterClient {
+class MediaStreamCenter FINAL : public blink::WebMediaStreamCenterClient {
 public:
-    ~MediaStreamCenter();
+    virtual ~MediaStreamCenter();
 
     static MediaStreamCenter& instance();
 
     bool getMediaStreamTrackSources(PassRefPtr<MediaStreamTrackSourcesRequest>);
 
     void didCreateMediaStreamTrack(MediaStreamComponent*);
     void didSetMediaStreamTrackEnabled(MediaStreamDescriptor*, MediaStreamComponent*);
     bool didStopMediaStreamTrack(MediaStreamComponent*);
 
     void didCreateMediaStream(MediaStreamDescriptor*);
     bool didAddMediaStreamTrack(MediaStreamDescriptor*, MediaStreamComponent*);
     bool didRemoveMediaStreamTrack(MediaStreamDescriptor*, MediaStreamComponent*);
     void didStopLocalMediaStream(MediaStreamDescriptor*);
 
     // blink::WebMediaStreamCenterClient
     virtual void stopLocalMediaStream(const blink::WebMediaStream&) OVERRIDE;
 
 private:
     MediaStreamCenter();
 
     OwnPtr<blink::WebMediaStreamCenter> m_private;
 };
 
 } // namespace WebCore
 
 #endif // MediaStreamCenter_h