Remove dead code for reflected attributes on <audio>, <video> and <track>

Source/core/html/HTMLTrackElement.cpp

 /*
  * 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 98 matching lines @@
             track()->setLabel(value);
         else if (name == srclangAttr)
             track()->setLanguage(value);
         else if (name == defaultAttr)
             track()->setIsDefault(!value.isNull());
     }
 
     HTMLElement::parseAttribute(name, value);
 }
 
-KURL HTMLTrackElement::src() const
-{
-    return document().completeURL(getAttribute(srcAttr));
-}
-
-void HTMLTrackElement::setSrc(const String& url)
-{
-    setAttribute(srcAttr, url);
-}
-
 String HTMLTrackElement::kind()
 {
     return track()->kind();
 }
 
 void HTMLTrackElement::setKind(const String& kind)
 {
     setAttribute(kindAttr, kind);
 }
 
@@ skipping 218 matching lines @@
 HTMLMediaElement* HTMLTrackElement::mediaElement() const
 {
     Element* parent = parentElement();
     if (parent && parent->isMediaElement())
         return toHTMLMediaElement(parentNode());
     return 0;
 }
 
 }