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

Source/core/svg/SVGImageElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Alexander Kellett <lypanov@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 205 matching lines @@
     if (!rootParent->inDocument())
         return InsertionDone;
     // Update image loader, as soon as we're living in the tree.
     // We can only resolve base URIs properly, after that!
     m_imageLoader.updateFromElement();
     return InsertionDone;
 }
 
 const AtomicString SVGImageElement::imageSourceURL() const
 {
-    return hrefCurrentValue();
+    return AtomicString(hrefCurrentValue());
 }
 
 void SVGImageElement::didMoveToNewDocument(Document& oldDocument)
 {
     m_imageLoader.elementDidMoveToNewDocument();
     SVGGraphicsElement::didMoveToNewDocument(oldDocument);
 }
 
 }