Remove HTMLVideoElement.

sky/engine/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 163 matching lines @@
     //
     // Express that by having the MediaSource keep a weak reference
     // to the media element and signal that it wants to be notified
     // of destruction if it survives a GC, but the media element
     // doesn't.
     void setCloseMediaSourceWhenFinalizing();
 #endif
 
     // Predicates also used when dispatching wrapper creation (cf. [SpecialWrapFor] IDL attribute usage.)
     virtual bool isHTMLAudioElement() const { return false; }
-    virtual bool isHTMLVideoElement() const { return false; }
 
 protected:
     HTMLMediaElement(const QualifiedName&, Document&);
     virtual ~HTMLMediaElement();
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual void finishParsingChildren() override final;
     virtual bool isURLAttribute(const Attribute&) const override;
     virtual void attach(const AttachContext& = AttachContext()) override;
 
@@ skipping 233 matching lines @@
 struct ValueToString<double> {
     static String string(const double value)
     {
         return String::number(value);
     }
 };
 #endif
 
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
-    return isHTMLAudioElement(element) || isHTMLVideoElement(element);
+    return isHTMLAudioElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } // namespace blink
 
 #endif // HTMLMediaElement_h