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

Source/modules/webaudio/OfflineAudioDestinationNode.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 21 matching lines @@
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class AudioBus;
 class AudioContext;
 
 class OfflineAudioDestinationHandler final : public AudioDestinationHandler {
 public:
     static PassRefPtr<OfflineAudioDestinationHandler> create(AudioNode&, AudioBuffer* renderTarget);
-    virtual ~OfflineAudioDestinationHandler();
+    ~OfflineAudioDestinationHandler() override;
 
     // AudioHandler
-    virtual void dispose() override;
-    virtual void initialize() override;
-    virtual void uninitialize() override;
+    void dispose() override;
+    void initialize() override;
+    void uninitialize() override;
 
     // AudioDestinationHandler
-    virtual void startRendering() override;
-    virtual void stopRendering() override;
+    void startRendering() override;
+    void stopRendering() override;
 
-    virtual float sampleRate()  const override { return m_renderTarget->sampleRate(); }
+    float sampleRate()  const override { return m_renderTarget->sampleRate(); }
 
 private:
     OfflineAudioDestinationHandler(AudioNode&, AudioBuffer* renderTarget);
     void offlineRender();
     void offlineRenderInternal();
 
     // For completion callback on main thread.
     void notifyComplete();
 
     // This AudioHandler renders into this AudioBuffer.
@@ skipping 12 matching lines @@
 public:
     static OfflineAudioDestinationNode* create(AudioContext*, AudioBuffer* renderTarget);
 
 private:
     OfflineAudioDestinationNode(AudioContext&, AudioBuffer* renderTarget);
 };
 
 } // namespace blink
 
 #endif // OfflineAudioDestinationNode_h