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

Source/modules/webaudio/OfflineAudioCompletionEvent.h

 /*
  * Copyright (C) 2011, 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 22 matching lines @@
 namespace blink {
 
 class AudioBuffer;
 
 class OfflineAudioCompletionEvent final : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<OfflineAudioCompletionEvent> create();
     static PassRefPtrWillBeRawPtr<OfflineAudioCompletionEvent> create(AudioBuffer* renderedBuffer);
 
-    virtual ~OfflineAudioCompletionEvent();
+    ~OfflineAudioCompletionEvent() override;
 
     AudioBuffer* renderedBuffer() { return m_renderedBuffer.get(); }
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     OfflineAudioCompletionEvent();
     explicit OfflineAudioCompletionEvent(AudioBuffer* renderedBuffer);
 
     PersistentWillBeMember<AudioBuffer> m_renderedBuffer;
 };
 
 } // namespace blink
 
 #endif // OfflineAudioCompletionEvent_h