Remove scaffolding for WebKit-proprietary fullscreen API

Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 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:
  * 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 595 matching lines @@
 
     // time has not changed since sending an "ended" event
     bool m_sentEndEvent : 1;
 
     bool m_pausedInternal : 1;
 
     // Not all media engines provide enough information about a file to be able to
     // support progress events so setting m_sendProgressEvents disables them 
     bool m_sendProgressEvents : 1;
 
-    bool m_isFullscreen : 1;
     bool m_closedCaptionsVisible : 1;
 
     bool m_dispatchingCanPlayEvent : 1;
     bool m_loadInitiatedByUserGesture : 1;
     bool m_completelyLoaded : 1;
     bool m_havePreparedToPlay : 1;
     bool m_parsingInProgress : 1;
 
     bool m_tracksAreReady : 1;
     bool m_haveVisibleTextTrack : 1;
@@ skipping 56 matching lines @@
 
 inline HTMLMediaElement* toMediaElement(Node* node)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || isMediaElement(node));
     return static_cast<HTMLMediaElement*>(node);
 }
 
 } //namespace
 
 #endif