Replaced HTMLIdentifier with an atomized string factory function

Source/core/html/parser/HTMLParserIdioms.cpp

 /*
  * Copyright (C) 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 260 matching lines @@
     if (a->hash() != b->hash())
         return false;
     return equalNonNull(a, b);
 }
 
 bool threadSafeMatch(const QualifiedName& a, const QualifiedName& b)
 {
     return threadSafeEqual(a.localName().impl(), b.localName().impl());
 }
 
-bool threadSafeMatch(const HTMLIdentifier& localName, const QualifiedName& qName)
+bool threadSafeMatch(const String& localName, const QualifiedName& qName)
 {
-    return threadSafeEqual(localName.asStringImpl(), qName.localName().impl());
+    return threadSafeEqual(localName.impl(), qName.localName().impl());
 }
 
 }