Fix virtual/override/final usage in Source/modules/.

Source/modules/webaudio/MediaStreamAudioSourceNode.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:
  * 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 24 matching lines @@
 #include "wtf/PassRefPtr.h"
 #include "wtf/Threading.h"
 
 namespace blink {
 
 class AudioContext;
 
 class MediaStreamAudioSourceHandler final : public AudioHandler {
 public:
     static PassRefPtr<MediaStreamAudioSourceHandler> create(AudioNode&, MediaStream&, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
-    virtual ~MediaStreamAudioSourceHandler();
+    ~MediaStreamAudioSourceHandler() override;
 
     MediaStream* mediaStream() { return m_mediaStream.get(); }
 
     // AudioHandler
-    virtual void process(size_t framesToProcess) override;
+    void process(size_t framesToProcess) override;
 
     // A helper for AudioSourceProviderClient implementation of
     // MediaStreamAudioSourceNode.
     void setFormat(size_t numberOfChannels, float sampleRate);
 
     AudioSourceProvider* audioSourceProvider() const { return m_audioSourceProvider.get(); }
 
 private:
     MediaStreamAudioSourceHandler(AudioNode&, MediaStream&, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
     // As an audio source, we will never propagate silence.
-    virtual bool propagatesSilence() const override { return false; }
+    bool propagatesSilence() const override { return false; }
 
     // These Persistents don't make reference cycles including the owner
     // MediaStreamAudioSourceNode.
     Persistent<MediaStream> m_mediaStream;
     Persistent<MediaStreamTrack> m_audioTrack;
     OwnPtr<AudioSourceProvider> m_audioSourceProvider;
 
     Mutex m_processLock;
 
     unsigned m_sourceNumberOfChannels;
@@ skipping 14 matching lines @@
 
 private:
     MediaStreamAudioSourceNode(AudioContext&, MediaStream&, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
 };
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)
 
 #endif // MediaStreamAudioSourceNode_h