Remove TextTrackCueBox

Source/core/html/track/TextTrackCue.h

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 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 20 matching lines @@
 
 #ifndef TextTrackCue_h
 #define TextTrackCue_h
 
 #include "core/events/EventTarget.h"
 #include "core/html/HTMLDivElement.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class Document;
 class ExceptionState;
-class TextTrackCue;
-
-// ----------------------------
-
-class TextTrackCueBox : public HTMLDivElement {
-public:
-    static const AtomicString& textTrackCueBoxShadowPseudoId()
-    {
-        DEFINE_STATIC_LOCAL(const AtomicString, trackDisplayBoxShadowPseudoId, ("-webkit-media-text-track-display", AtomicString::ConstructFromLiteral));
-        return trackDisplayBoxShadowPseudoId;
-    }
-
-protected:
-    TextTrackCueBox(Document&);
-};
-
-// ----------------------------
 
 class TextTrackCue : public RefCounted<TextTrackCue>, public EventTargetWithInlineData {
     REFCOUNTED_EVENT_TARGET(TextTrackCue);
 public:
     static bool isInfiniteOrNonNumber(double value, const char* method, ExceptionState&);
 
     static const AtomicString& cueShadowPseudoId()
     {
         DEFINE_STATIC_LOCAL(const AtomicString, cue, ("cue", AtomicString::ConstructFromLiteral));
         return cue;
@@ skipping 54 matching lines @@
 
     TextTrack* m_track;
 
     bool m_isActive;
     bool m_pauseOnExit;
 };
 
 } // namespace WebCore
 
 #endif