Remove TextTrackClient interface to simplify TextTrack code.

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 43 matching lines @@
     : HTMLElement(trackTag, document)
     , m_loadTimer(this, &HTMLTrackElement::loadTimerFired)
 {
     WTF_LOG(Media, "HTMLTrackElement::HTMLTrackElement - %p", this);
     ScriptWrappable::init(this);
 }
 
 HTMLTrackElement::~HTMLTrackElement()
 {
     if (m_track)
-        m_track->clearClient();
+        m_track->clearTrackElement();
 }
 
 PassRefPtr<HTMLTrackElement> HTMLTrackElement::create(Document& document)
 {
     return adoptRef(new HTMLTrackElement(document));
 }
 
 Node::InsertionNotificationRequest HTMLTrackElement::insertedInto(ContainerNode* insertionPoint)
 {
     WTF_LOG(Media, "HTMLTrackElement::insertedInto");
@@ skipping 182 matching lines @@
 }
 
 const AtomicString& HTMLTrackElement::mediaElementCrossOriginAttribute() const
 {
     if (HTMLMediaElement* parent = mediaElement())
         return parent->fastGetAttribute(HTMLNames::crossoriginAttr);
 
     return nullAtom;
 }
 
-void HTMLTrackElement::textTrackKindChanged(TextTrack* track)
-{
-    if (HTMLMediaElement* parent = mediaElement())
-        return parent->textTrackKindChanged(track);
-}
-
-void HTMLTrackElement::textTrackModeChanged(TextTrack* track)
-{
-    // Since we've moved to a new parent, we may now be able to load.
-    if (readyState() == HTMLTrackElement::NONE)
-        scheduleLoad();
-
-    if (HTMLMediaElement* parent = mediaElement())
-        return parent->textTrackModeChanged(track);
-}
-
-void HTMLTrackElement::textTrackAddCues(TextTrack* track, const TextTrackCueList* cues)
-{
-    if (HTMLMediaElement* parent = mediaElement())
-        return parent->textTrackAddCues(track, cues);
-}
-
-void HTMLTrackElement::textTrackRemoveCues(TextTrack* track, const TextTrackCueList* cues)
-{
-    if (HTMLMediaElement* parent = mediaElement())
-        return parent->textTrackRemoveCues(track, cues);
-}
-
-void HTMLTrackElement::textTrackAddCue(TextTrack* track, PassRefPtr<TextTrackCue> cue)
-{
-    if (HTMLMediaElement* parent = mediaElement())
-        return parent->textTrackAddCue(track, cue);
-}
-
-void HTMLTrackElement::textTrackRemoveCue(TextTrack* track, PassRefPtr<TextTrackCue> cue)
-{
-    if (HTMLMediaElement* parent = mediaElement())
-        return parent->textTrackRemoveCue(track, cue);
-}
-
 HTMLMediaElement* HTMLTrackElement::mediaElement() const
 {
     Element* parent = parentElement();
     if (parent && parent->isMediaElement())
         return toHTMLMediaElement(parentNode());
     return 0;
 }
 
 }