InlinedVisitor: Migrate xml to use inlined tracing

Source/core/xml/XPathExpression.h

 /*
  * Copyright 2005 Frerich Raabe <raabe@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 38 matching lines @@
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<XPathExpression> create()
     {
         return adoptRefWillBeNoop(new XPathExpression);
     }
 
     static PassRefPtrWillBeRawPtr<XPathExpression> createExpression(const String& expression, PassRefPtrWillBeRawPtr<XPathNSResolver>, ExceptionState&);
     PassRefPtrWillBeRawPtr<XPathResult> evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionState&);
 
-    void trace(Visitor*);
+    DECLARE_TRACE();
 
 private:
     XPathExpression();
 
     OwnPtrWillBeMember<XPath::Expression> m_topExpression;
 };
 
 } // namespace blink
 
 #endif // XPathExpression_h