Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/mediastream/MediaStreamEvent.h

 /*
  * Copyright (C) 2011 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 struct MediaStreamEventInit : public EventInit {
     MediaStreamEventInit();
 
     RefPtr<MediaStream> stream;
 };
 
-class MediaStreamEvent : public Event {
+class MediaStreamEvent FINAL : public Event {
 public:
     virtual ~MediaStreamEvent();
 
     static PassRefPtr<MediaStreamEvent> create();
     static PassRefPtr<MediaStreamEvent> create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<MediaStream>);
     static PassRefPtr<MediaStreamEvent> create(const AtomicString& type, const MediaStreamEventInit& initializer);
 
     MediaStream* stream() const;
     MediaStream* stream(bool&) const;
 
-    virtual const AtomicString& interfaceName() const;
+    virtual const AtomicString& interfaceName() const OVERRIDE;
 
 private:
     MediaStreamEvent();
     MediaStreamEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<MediaStream>);
     MediaStreamEvent(const AtomicString& type, const MediaStreamEventInit&);
 
     RefPtr<MediaStream> m_stream;
 };
 
 } // namespace WebCore
 
 #endif // MediaStreamEvent_h