Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/webaudio/DelayNode.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 16 matching lines @@
 
 #include "modules/webaudio/AudioBasicProcessorNode.h"
 #include "modules/webaudio/DelayProcessor.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 class AudioParam;
 class ExceptionState;
 
-class DelayNode : public AudioBasicProcessorNode {
+class DelayNode FINAL : public AudioBasicProcessorNode {
 public:
     static PassRefPtr<DelayNode> create(AudioContext* context, float sampleRate, double maxDelayTime, ExceptionState& exceptionState)
     {
         return adoptRef(new DelayNode(context, sampleRate, maxDelayTime, exceptionState));
     }
 
     AudioParam* delayTime();
 
 private:
     DelayNode(AudioContext*, float sampleRate, double maxDelayTime, ExceptionState&);
 
     DelayProcessor* delayProcessor() { return static_cast<DelayProcessor*>(processor()); }
 };
 
 } // namespace WebCore
 
 #endif // DelayNode_h