Rename childNodeCount() / childNode() methods for clarity

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 698 matching lines @@
         TextTrackCue* cue = activeCues[i].data();
 
         ASSERT(cue->isActive());
         if (!cue->track() || !cue->track()->isRendered() || !cue->isActive())
             continue;
 
         cue->updateDisplay(m_videoDisplaySize.size(), *this);
     }
 
     // 11. Return output.
-    if (hasChildNodes())
+    if (hasChildren())
         show();
     else
         hide();
 }
 
 void MediaControlTextTrackContainerElement::updateSizes()
 {
     HTMLMediaElement* mediaElement = toParentMediaElement(this);
     if (!mediaElement)
         return;
@@ skipping 16 matching lines @@
     float fontSize = smallestDimension * 0.05f;
     if (fontSize != m_fontSize) {
         m_fontSize = fontSize;
         setInlineStyleProperty(CSSPropertyFontSize, fontSize, CSSPrimitiveValue::CSS_PX);
     }
 }
 
 // ----------------------------
 
 } // namespace WebCore