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

Source/modules/webaudio/MediaElementAudioSourceNode.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 24 matching lines @@
 #include "wtf/ThreadingPrimitives.h"
 
 namespace blink {
 
 class AudioContext;
 class HTMLMediaElement;
 
 class MediaElementAudioSourceHandler final : public AudioHandler {
 public:
     static PassRefPtr<MediaElementAudioSourceHandler> create(AudioNode&, HTMLMediaElement&);
-    virtual ~MediaElementAudioSourceHandler();
+    ~MediaElementAudioSourceHandler() override;
 
     HTMLMediaElement* mediaElement() { return m_mediaElement.get(); }
 
     // AudioHandler
-    virtual void dispose() override;
-    virtual void process(size_t framesToProcess) override;
+    void dispose() override;
+    void process(size_t framesToProcess) override;
 
     // Helpers for AudioSourceProviderClient implementation of
     // MediaElementAudioSourceNode.
     void setFormat(size_t numberOfChannels, float sampleRate);
     void onCurrentSrcChanged(const KURL& currentSrc);
     void lock();
     void unlock();
 
 private:
     MediaElementAudioSourceHandler(AudioNode&, HTMLMediaElement&);
     // As an audio source, we will never propagate silence.
-    virtual bool propagatesSilence() const override { return false; }
+    bool propagatesSilence() const override { return false; }
 
     // Must be called only on the audio thread.
     bool passesCORSAccessCheck();
 
     // Must be called only on the main thread.
     bool passesCurrentSrcCORSAccessCheck(const KURL& currentSrc);
 
     // Print warning if CORS restrictions cause MediaElementAudioSource to output zeroes.
     void printCORSMessage(const String& message);
 
@@ skipping 42 matching lines @@
 
 private:
     MediaElementAudioSourceNode(AudioContext&, HTMLMediaElement&);
 };
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)
 
 #endif // MediaElementAudioSourceNode_h