Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/mediasource/MediaSourceRegistry.h

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
 #include "core/html/URLRegistry.h"
 #include "wtf/HashMap.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/StringHash.h"
 
 namespace WebCore {
 
 class KURL;
 class MediaSourceBase;
 
-class MediaSourceRegistry : public URLRegistry {
+class MediaSourceRegistry FINAL : public URLRegistry {
 public:
     // Returns a single instance of MediaSourceRegistry.
     static MediaSourceRegistry& registry();
 
     // Registers a blob URL referring to the specified media source.
     virtual void registerURL(SecurityOrigin*, const KURL&, URLRegistrable*) OVERRIDE;
     virtual void unregisterURL(const KURL&) OVERRIDE;
     virtual URLRegistrable* lookup(const String&) OVERRIDE;
 
 private:
     MediaSourceRegistry();
     HashMap<String, RefPtr<MediaSourceBase> > m_mediaSources;
 };
 
 } // namespace WebCore
 
 #endif