Enable WTF::HashSet<OwnPtr<> >

Source/core/xml/XPathParser.h

 /*
  * Copyright 2005 Maksim Orlovich <maksim@kde.org>
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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.
@@ skipping 108 matching lines @@
     static Parser* currentParser;
 
     unsigned m_nextPos;
     String m_data;
     int m_lastTokenType;
     RefPtrWillBeMember<XPathNSResolver> m_resolver;
 
     HashSet<ParseNode*> m_parseNodes;
     HashSet<Vector<OwnPtr<Predicate> >*> m_predicateVectors;
     HashSet<Vector<OwnPtr<Expression> >*> m_expressionVectors;
-    HashSet<String*> m_strings;
-    HashSet<Step::NodeTest*> m_nodeTests;
+    HashSet<OwnPtr<String> > m_strings;
+    HashSet<OwnPtr<Step::NodeTest> > m_nodeTests;
 };
 
 } // XPath
 
 } // WebCore
 
 #endif