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

Source/modules/webaudio/ChannelMergerNode.h

 /*
  * Copyright (C) 2010 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
@@ skipping 22 matching lines @@
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class AudioContext;
 
 class ChannelMergerHandler final : public AudioHandler {
 public:
     static PassRefPtr<ChannelMergerHandler> create(AudioNode&, float sampleRate, unsigned numberOfInputs);
 
-    virtual void process(size_t framesToProcess) override;
-    virtual void setChannelCount(unsigned long, ExceptionState&) final;
-    virtual void setChannelCountMode(const String&, ExceptionState&) final;
+    void process(size_t framesToProcess) override;
+    void setChannelCount(unsigned long, ExceptionState&) final;
+    void setChannelCountMode(const String&, ExceptionState&) final;
 
 private:
     ChannelMergerHandler(AudioNode&, float sampleRate, unsigned numberOfInputs);
 };
 
 class ChannelMergerNode final : public AudioNode {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static ChannelMergerNode* create(AudioContext&, float sampleRate, unsigned numberOfInputs);
 
 private:
     ChannelMergerNode(AudioContext&, float sampleRate, unsigned numberOfInputs);
 };
 
 } // namespace blink
 
 #endif // ChannelMergerNode_h