Remove virtual destructor for WebVTTParser

Source/core/html/track/WebVTTParser.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 39 matching lines @@
 public:
     virtual ~WebVTTParserClient() { }
 
     virtual void newCuesParsed() = 0;
     virtual void newRegionsParsed() = 0;
     virtual void fileFailedToParse() = 0;
 };
 
 class WebVTTParser {
 public:
-    virtual ~WebVTTParser() { }
-
     enum ParseState {
         Initial,
         Header,
         Id,
         TimingsAndSettings,
         CueText,
         BadCue
     };
 
     static PassOwnPtr<WebVTTParser> create(WebVTTParserClient* client, Document& document)
@@ skipping 81 matching lines @@
 
     Vector<AtomicString> m_languageStack;
     Vector<RefPtr<TextTrackCue> > m_cuelist;
 
     Vector<RefPtr<TextTrackRegion> > m_regionList;
 };
 
 } // namespace WebCore
 
 #endif