Make calls to AtomicString(const String&) explicit in html/

Source/core/html/HTMLVideoElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 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 30 matching lines @@
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 inline HTMLVideoElement::HTMLVideoElement(Document& document, bool createdByParser)
     : HTMLMediaElement(videoTag, document, createdByParser)
 {
     ScriptWrappable::init(this);
     if (document.settings())
-        m_defaultPosterURL = document.settings()->defaultVideoPosterURL();
+        m_defaultPosterURL = AtomicString(document.settings()->defaultVideoPosterURL());
 }
 
 PassRefPtr<HTMLVideoElement> HTMLVideoElement::create(Document& document, bool createdByParser)
 {
     RefPtr<HTMLVideoElement> videoElement(adoptRef(new HTMLVideoElement(document, createdByParser)));
     videoElement->suspendIfNeeded();
     return videoElement.release();
 }
 
 bool HTMLVideoElement::rendererIsNeeded(const RenderStyle& style)
@@ skipping 202 matching lines @@
 
 KURL HTMLVideoElement::posterImageURL() const
 {
     String url = stripLeadingAndTrailingHTMLSpaces(imageSourceURL());
     if (url.isEmpty())
         return KURL();
     return document().completeURL(url);
 }
 
 }