Use xmlAtom / starAtom when possible instead of string literals

Source/core/svg/SVGLangSpace.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 49 matching lines @@
     return false;
 }
 
 bool SVGLangSpace::isKnownAttribute(const QualifiedName& attrName)
 {
     return attrName.matches(XMLNames::langAttr) || attrName.matches(XMLNames::spaceAttr);
 }
 
 void SVGLangSpace::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes)
 {
-    DEFINE_STATIC_LOCAL(AtomicString, xmlPrefix, ("xml", AtomicString::ConstructFromLiteral));
-
     QualifiedName langWithPrefix = XMLNames::langAttr;
-    langWithPrefix.setPrefix(xmlPrefix);
+    langWithPrefix.setPrefix(xmlAtom);
     supportedAttributes.add(langWithPrefix);
     supportedAttributes.add(XMLNames::langAttr);
 
     QualifiedName spaceWithPrefix = XMLNames::spaceAttr;
-    spaceWithPrefix.setPrefix(xmlPrefix);
+    spaceWithPrefix.setPrefix(xmlAtom);
     supportedAttributes.add(spaceWithPrefix);
     supportedAttributes.add(XMLNames::spaceAttr);
 }
 
 }