Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/audio/EqualPowerPanner.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 17 matching lines @@
 #include "platform/audio/Panner.h"
 
 namespace WebCore {
 
 // Common type of stereo panner as found in normal audio mixing equipment.
 
 class PLATFORM_EXPORT EqualPowerPanner : public Panner {
 public:
     EqualPowerPanner(float sampleRate);
 
-    virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBuf, size_t framesToProcess);
+    virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBuf, size_t framesToProcess) OVERRIDE;
 
-    virtual void reset() { m_isFirstRender = true; }
+    virtual void reset() OVERRIDE { m_isFirstRender = true; }
 
     virtual double tailTime() const OVERRIDE { return 0; }
     virtual double latencyTime() const OVERRIDE { return 0; }
 
 private:
     // For smoothing / de-zippering
     bool m_isFirstRender;
     double m_smoothingConstant;
 
     double m_gainL;
     double m_gainR;
 };
 
 } // namespace WebCore
 
 #endif // EqualPowerPanner_h