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

Source/modules/webaudio/AudioParam.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 45 matching lines @@
 
     static PassRefPtr<AudioParamHandler> create(AudioContext& context, double defaultValue)
     {
         return adoptRef(new AudioParamHandler(context, defaultValue));
     }
     DECLARE_TRACE();
     // This should be used only in audio rendering thread.
     AudioContext* context() const;
 
     // AudioSummingJunction
-    virtual void didUpdate() override { }
+    void didUpdate() override { }
 
     AudioParamTimeline& timeline() { return m_timeline; }
 
     // Intrinsic value.
     float value();
     void setValue(float);
 
     // Final value for k-rate parameters, otherwise use calculateSampleAccurateValues() for a-rate.
     // Must be called in the audio thread.
     float finalValue();
@@ skipping 71 matching lines @@
 private:
     AudioParam(AudioContext&, double defaultValue);
 
     RefPtr<AudioParamHandler> m_handler;
     Member<AudioContext> m_context;
 };
 
 } // namespace blink
 
 #endif // AudioParam_h