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

Source/modules/webaudio/StereoPannerNode.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef StereoPannerNode_h
 #define StereoPannerNode_h
 
 #include "modules/webaudio/AudioNode.h"
 #include "modules/webaudio/AudioParam.h"
 #include "platform/audio/AudioBus.h"
 #include "platform/audio/Spatializer.h"
 
 namespace blink {
 
 // StereoPannerNode is an AudioNode with one input and one output. It is
 // specifically designed for equal-power stereo panning.
 class StereoPannerHandler final : public AudioHandler {
 public:
     static PassRefPtr<StereoPannerHandler> create(AudioNode&, float sampleRate, AudioParamHandler& pan);
-    virtual ~StereoPannerHandler();
+    ~StereoPannerHandler() override;
 
-    virtual void process(size_t framesToProcess) override;
-    virtual void initialize() override;
+    void process(size_t framesToProcess) override;
+    void initialize() override;
 
-    virtual void setChannelCount(unsigned long, ExceptionState&) final;
-    virtual void setChannelCountMode(const String&, ExceptionState&) final;
+    void setChannelCount(unsigned long, ExceptionState&) final;
+    void setChannelCountMode(const String&, ExceptionState&) final;
 
 private:
     StereoPannerHandler(AudioNode&, float sampleRate, AudioParamHandler& pan);
 
     OwnPtr<Spatializer> m_stereoPanner;
     RefPtr<AudioParamHandler> m_pan;
 
     AudioFloatArray m_sampleAccuratePanValues;
 
     // TODO(tkent): Use FRIEND_TEST macro provided by gtest_prod.h
@@ skipping 10 matching lines @@
 
 private:
     StereoPannerNode(AudioContext&, float sampleRate);
 
     Member<AudioParam> m_pan;
 };
 
 } // namespace blink
 
 #endif // StereoPannerNode_h