Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/mediasource/SourceBuffer.h

 /*
  * Copyright (C) 2013 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 39 matching lines @@
 
 namespace WebCore {
 
 class ExceptionState;
 class FileReaderLoader;
 class GenericEventQueue;
 class MediaSource;
 class Stream;
 class TimeRanges;
 
-class SourceBuffer : public RefCounted<SourceBuffer>, public ActiveDOMObject, public EventTargetWithInlineData, public ScriptWrappable, public FileReaderLoaderClient {
+class SourceBuffer FINAL : public RefCounted<SourceBuffer>, public ActiveDOMObject, public EventTargetWithInlineData, public ScriptWrappable, public FileReaderLoaderClient {
     REFCOUNTED_EVENT_TARGET(SourceBuffer);
 public:
     static PassRefPtr<SourceBuffer> create(PassOwnPtr<blink::WebSourceBuffer>, MediaSource*, GenericEventQueue*);
     static const AtomicString& segmentsKeyword();
     static const AtomicString& sequenceKeyword();
 
     virtual ~SourceBuffer();
 
     // SourceBuffer.idl methods
     const AtomicString& mode() const { return m_mode; }
@@ skipping 68 matching lines @@
     bool m_streamMaxSizeValid;
     unsigned long long m_streamMaxSize;
     AsyncMethodRunner<SourceBuffer> m_appendStreamAsyncPartRunner;
     RefPtr<Stream> m_stream;
     OwnPtr<FileReaderLoader> m_loader;
 };
 
 } // namespace WebCore
 
 #endif