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

Source/modules/webaudio/OscillatorNode.h

 /*
  * Copyright (C) 2012, 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 36 matching lines @@
     // These must be defined as in the .idl file.
     enum {
         SINE = 0,
         SQUARE = 1,
         SAWTOOTH = 2,
         TRIANGLE = 3,
         CUSTOM = 4
     };
 
     static PassRefPtr<OscillatorHandler> create(AudioNode&, float sampleRate, AudioParamHandler& frequency, AudioParamHandler& detune);
-    virtual ~OscillatorHandler();
+    ~OscillatorHandler() override;
 
     // AudioHandler
-    virtual void process(size_t framesToProcess) override;
+    void process(size_t framesToProcess) override;
 
     String type() const;
     void setType(const String&, ExceptionState&);
 
     void setPeriodicWave(PeriodicWave*);
 
 private:
     OscillatorHandler(AudioNode&, float sampleRate, AudioParamHandler& frequency, AudioParamHandler& detune);
     bool setType(unsigned); // Returns true on success.
 
     // Returns true if there are sample-accurate timeline parameter changes.
     bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess);
 
-    virtual bool propagatesSilence() const override;
+    bool propagatesSilence() const override;
 
     // One of the waveform types defined in the enum.
     unsigned short m_type;
 
     // Frequency value in Hertz.
     RefPtr<AudioParamHandler> m_frequency;
 
     // Detune value (deviating from the frequency) in Cents.
     RefPtr<AudioParamHandler> m_detune;
 
@@ skipping 31 matching lines @@
     OscillatorNode(AudioContext&, float sampleRate);
     OscillatorHandler& oscillatorHandler() const;
 
     Member<AudioParam> m_frequency;
     Member<AudioParam> m_detune;
 };
 
 } // namespace blink
 
 #endif // OscillatorNode_h