Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

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 27 matching lines @@
 class ExceptionState;
 class Node;
 class XPathNSResolver;
 class XPathResult;
 
 namespace XPath {
 class Expression;
 }
 
 class XPathExpression : public RefCountedWillBeGarbageCollectedFinalized<XPathExpression>, public ScriptWrappable {
-    DECLARE_GC_INFO;
 public:
     static PassRefPtrWillBeRawPtr<XPathExpression> create()
     {
         return adoptRefWillBeNoop(new XPathExpression);
     }
     ~XPathExpression();
 
     static PassRefPtrWillBeRawPtr<XPathExpression> createExpression(const String& expression, PassRefPtrWillBeRawPtr<XPathNSResolver>, ExceptionState&);
     PassRefPtrWillBeRawPtr<XPathResult> evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionState&);
 
     void trace(Visitor*) { }
 
 private:
     XPathExpression()
     {
         ScriptWrappable::init(this);
     }
 
     XPath::Expression* m_topExpression;
 };
 
 }
 
 #endif // XPathExpression_h