Remove duplicated headers from core/

Source/core/html/track/TextTrackCue.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2011, 2012, 2013 Apple 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.
@@ skipping 17 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/track/TextTrackCue.h"
 
 #include "bindings/v8/ExceptionMessages.h"
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/events/Event.h"
-#include "core/html/HTMLDivElement.h"
 #include "core/html/track/TextTrack.h"
 #include "core/html/track/TextTrackCueList.h"
 
 namespace WebCore {
 
 static const int invalidCueIndex = -1;
 
 // ----------------------------
 
 TextTrackCueBox::TextTrackCueBox(Document& document)
@@ skipping 134 matching lines @@
     if (!active)
         removeDisplayTree();
 }
 
 const AtomicString& TextTrackCue::interfaceName() const
 {
     return EventTargetNames::TextTrackCue;
 }
 
 } // namespace WebCore