Make sure getAttribute() / setAttribute() callers use AtomicStrings

Source/core/html/HTMLAnchorElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 321 matching lines @@
     setAttribute(hrefAttr, value);
 }
 
 KURL HTMLAnchorElement::url() const
 {
     return href();
 }
 
 void HTMLAnchorElement::setURL(const KURL& url)
 {
-    setHref(url.string());
+    setHref(AtomicString(url.string()));
 }
 
 String HTMLAnchorElement::input() const
 {
     return getAttribute(hrefAttr);
 }
 
 void HTMLAnchorElement::setInput(const String& value)
 {
     setHref(value);
@@ skipping 339 matching lines @@
     preconnectToURL(url, motivation);
     m_hasIssuedPreconnect = true;
 }
 
 bool HTMLAnchorElement::isInteractiveContent() const
 {
     return true;
 }
 
 }