Replace Element::isMediaElement() with isHTMLMediaElement

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 267 matching lines @@
     virtual void finishParsingChildren() OVERRIDE FINAL;
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
     virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
 
     virtual void didMoveToNewDocument(Document& oldDocument) OVERRIDE;
 
     enum DisplayMode { Unknown, Poster, PosterWaitingForVideo, Video };
     DisplayMode displayMode() const { return m_displayMode; }
     virtual void setDisplayMode(DisplayMode mode) { m_displayMode = mode; }
 
-    virtual bool isMediaElement() const OVERRIDE FINAL { return true; }
-
     void setControllerInternal(PassRefPtr<MediaController>);
 
     bool ignoreTrackDisplayUpdateRequests() const { return m_ignoreTrackDisplayUpdate > 0; }
     void beginIgnoringTrackDisplayUpdateRequests();
     void endIgnoringTrackDisplayUpdateRequests();
 
 private:
     void createMediaPlayer();
 
     virtual bool alwaysCreateUserAgentShadowRoot() const OVERRIDE FINAL { return true; }
@@ skipping 238 matching lines @@
 struct ValueToString<TextTrackCue*> {
     static String string(TextTrackCue* const& cue)
     {
         return cue->toString();
     }
 };
 #endif
 
 inline bool isHTMLMediaElement(const Node& node)
 {
-    return node.isElementNode() && toElement(node).isMediaElement();
+    return isHTMLAudioElement(node) || isHTMLVideoElement(node);
+}
+
+inline bool isHTMLMediaElement(const Node* node)
+{
+    return node && isHTMLMediaElement(*node);
 }
 
 DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } //namespace
 
 #endif