InlinedVisitor: Migrate xml to use inlined tracing

Source/core/xml/XPathResult.h

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 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.
@@ skipping 63 matching lines @@
     bool booleanValue(ExceptionState&) const;
     Node* singleNodeValue(ExceptionState&) const;
 
     bool invalidIteratorState() const;
     unsigned snapshotLength(ExceptionState&) const;
     Node* iterateNext(ExceptionState&);
     Node* snapshotItem(unsigned index, ExceptionState&);
 
     const XPath::Value& value() const { return m_value; }
 
-    void trace(Visitor*);
+    DECLARE_TRACE();
 
 private:
     XPathResult(XPath::EvaluationContext&, const XPath::Value&);
     XPath::NodeSet& nodeSet() { return *m_nodeSet; }
 
     XPath::Value m_value;
     unsigned m_nodeSetPosition;
     OwnPtrWillBeMember<XPath::NodeSet> m_nodeSet; // FIXME: why duplicate the node set stored in m_value?
     unsigned short m_resultType;
     RefPtrWillBeMember<Document> m_document;
     uint64_t m_domTreeVersion;
 };
 
 } // namespace blink
 
 #endif // XPathResult_h