Revert of [Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/html/track/TrackBase.cpp

 /*
  * Copyright (C) 2013 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 40 matching lines @@
 {
 }
 
 TrackBase::~TrackBase()
 {
 #if !ENABLE(OILPAN)
     ASSERT(!m_mediaElement);
 #endif
 }
 
-void TrackBase::setMediaElement(HTMLMediaElement* mediaElement)
-{
-    m_mediaElement = mediaElement;
-}
-
-HTMLMediaElement* TrackBase::mediaElement() const
-{
-    return m_mediaElement;
-}
-
 Node* TrackBase::owner() const
 {
     return m_mediaElement;
 }
 
 DEFINE_TRACE(TrackBase)
 {
     visitor->trace(m_mediaElement);
 }
 
 void TrackBase::setKind(const AtomicString& kind)
 {
     if (isValidKind(kind))
         m_kind = kind;
     else
         m_kind = defaultKind();
 }
 
 } // namespace blink