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

Source/modules/webaudio/DefaultAudioDestinationNode.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 19 matching lines @@
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 class AudioContext;
 class ExceptionState;
 
 class DefaultAudioDestinationHandler final : public AudioDestinationHandler {
 public:
     static PassRefPtr<DefaultAudioDestinationHandler> create(AudioNode&);
-    virtual ~DefaultAudioDestinationHandler();
+    ~DefaultAudioDestinationHandler() override;
 
     // AudioHandler
-    virtual void dispose() override;
-    virtual void initialize() override;
-    virtual void uninitialize() override;
-    virtual void setChannelCount(unsigned long, ExceptionState&) override;
+    void dispose() override;
+    void initialize() override;
+    void uninitialize() override;
+    void setChannelCount(unsigned long, ExceptionState&) override;
 
     // AudioDestinationHandler
-    virtual void startRendering() override;
-    virtual void stopRendering() override;
-    virtual unsigned long maxChannelCount() const override;
+    void startRendering() override;
+    void stopRendering() override;
+    unsigned long maxChannelCount() const override;
 
 private:
     explicit DefaultAudioDestinationHandler(AudioNode&);
     void createDestination();
 
     OwnPtr<AudioDestination> m_destination;
     String m_inputDeviceId;
     unsigned m_numberOfInputChannels;
 };
 
 class DefaultAudioDestinationNode final : public AudioDestinationNode {
 public:
     static DefaultAudioDestinationNode* create(AudioContext*);
 
 private:
     explicit DefaultAudioDestinationNode(AudioContext&);
 };
 
 } // namespace blink
 
 #endif // DefaultAudioDestinationNode_h