Avoid to include IDL-generated headers from EventTarget.h and Node.h

third_party/WebKit/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
@@ skipping 11 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLMediaElement_h
 #define HTMLMediaElement_h
 
 #include <memory>
 #include "bindings/core/v8/ActiveScriptWrappable.h"
+#include "bindings/core/v8/Nullable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/TraceWrapperMember.h"
 #include "core/CoreExport.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/SuspendableObject.h"
 #include "core/events/GenericEventQueue.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLMediaElementControlsList.h"
 #include "core/html/track/TextTrack.h"
 #include "platform/Supplementable.h"
@@ skipping 717 matching lines @@
 
 inline bool isHTMLMediaElement(const HTMLElement& element) {
   return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 }  // namespace blink
 
 #endif  // HTMLMediaElement_h