Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

Source/core/xml/XPathExpression.cpp

 /*
  * 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 20 matching lines @@
 #include "core/dom/ExceptionCode.h"
 #include "core/xml/XPathExpressionNode.h"
 #include "core/xml/XPathNSResolver.h"
 #include "core/xml/XPathParser.h"
 #include "core/xml/XPathResult.h"
 #include "core/xml/XPathUtil.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-DEFINE_GC_INFO(XPathExpression);
-
 using namespace XPath;
 
 PassRefPtrWillBeRawPtr<XPathExpression> XPathExpression::createExpression(const String& expression, PassRefPtrWillBeRawPtr<XPathNSResolver> resolver, ExceptionState& exceptionState)
 {
     RefPtrWillBeRawPtr<XPathExpression> expr = XPathExpression::create();
     Parser parser;
 
     expr->m_topExpression = parser.parseStatement(expression, resolver, exceptionState);
     if (!expr->m_topExpression)
         return nullptr;
@@ skipping 35 matching lines @@
     if (type != XPathResult::ANY_TYPE) {
         result->convertTo(type, exceptionState);
         if (exceptionState.hadException())
             return nullptr;
     }
 
     return result;
 }
 
 }