Remove what remains of MediaControllerInterface

Source/core/html/shadow/MediaControlElementTypes.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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.
@@ skipping 61 matching lines @@
     , m_displayType(displayType)
     , m_element(element)
 {
 }
 
 HTMLMediaElement& MediaControlElement::mediaElement() const
 {
     return mediaControls().mediaElement();
 }
 
-MediaControllerInterface& MediaControlElement::mediaControllerInterface() const
-{
-    return mediaControls().mediaControllerInterface();
-}
-
 void MediaControlElement::hide()
 {
     m_element->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone);
 }
 
 void MediaControlElement::show()
 {
     m_element->removeInlineStyleProperty(CSSPropertyDisplay);
 }
 
@@ skipping 35 matching lines @@
     , m_currentValue(0)
 {
 }
 
 void MediaControlTimeDisplayElement::setCurrentValue(double time)
 {
     m_currentValue = time;
 }
 
 } // namespace WebCore