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

Source/modules/webaudio/DelayProcessor.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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class AudioDSPKernel;
 
 class DelayProcessor final : public AudioDSPKernelProcessor {
 public:
     DelayProcessor(float sampleRate, unsigned numberOfChannels, AudioParamHandler& delayTime, double maxDelayTime);
-    virtual ~DelayProcessor();
+    ~DelayProcessor() override;
 
-    virtual PassOwnPtr<AudioDSPKernel> createKernel() override;
+    PassOwnPtr<AudioDSPKernel> createKernel() override;
 
     AudioParamHandler& delayTime() const { return *m_delayTime; }
     double maxDelayTime() { return m_maxDelayTime; }
 
 private:
     RefPtr<AudioParamHandler> m_delayTime;
     double m_maxDelayTime;
 };
 
 } // namespace blink
 
 #endif // DelayProcessor_h