Replace HTMLMediaElement::isVideo() with isHTMLVideoElement

Source/core/html/shadow/MediaControlElements.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google 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.
@@ skipping 686 matching lines @@
 void MediaControlTextTrackContainerElement::updateDisplay()
 {
     if (!mediaControllerInterface().closedCaptionsVisible()) {
         removeChildren();
         return;
     }
 
     // 1. If the media element is an audio element, or is another playback
     // mechanism with no rendering area, abort these steps. There is nothing to
     // render.
-    if (!mediaElement().isVideo())
+    if (isHTMLAudioElement(mediaElement()))
         return;
 
     // 2. Let video be the media element or other playback mechanism.
     HTMLVideoElement& video = toHTMLVideoElement(mediaElement());
 
     // 3. Let output be an empty list of absolutely positioned CSS block boxes.
     Vector<RefPtr<HTMLDivElement> > output;
 
     // 4. If the user agent is exposing a user interface for video, add to
     // output one or more completely transparent positioned CSS block boxes that
@@ skipping 64 matching lines @@
     float fontSize = smallestDimension * 0.05f;
     if (fontSize != m_fontSize) {
         m_fontSize = fontSize;
         setInlineStyleProperty(CSSPropertyFontSize, fontSize, CSSPrimitiveValue::CSS_PX);
     }
 }
 
 // ----------------------------
 
 } // namespace WebCore