Remove interactive content and form related API from HTMLElement.

sky/engine/core/html/HTMLMediaElement.cpp

 /*
  * 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 2396 matching lines @@
     if (m_webLayer) {
         GraphicsLayer::registerContentsLayer(m_webLayer);
     }
 }
 
 void HTMLMediaElement::mediaPlayerMediaSourceOpened(blink::WebMediaSource* webMediaSource)
 {
     m_mediaSource->setWebMediaSourceAndOpen(adoptPtr(webMediaSource));
 }
 
-bool HTMLMediaElement::isInteractiveContent() const
-{
-    return hasAttribute(HTMLNames::controlsAttr);
-}
-
 void HTMLMediaElement::defaultEventHandler(Event* event)
 {
     HTMLElement::defaultEventHandler(event);
 }
 
 }