Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

Source/core/css/StyleSheetList.cpp

 /**
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 11 matching lines @@
 #include "core/css/StyleSheetList.h"
 
 #include "HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/StyleEngine.h"
 #include "core/html/HTMLStyleElement.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-DEFINE_GC_INFO(StyleSheetList);
-
 using namespace HTMLNames;
 
 StyleSheetList::StyleSheetList(TreeScope* treeScope)
     : m_treeScope(treeScope)
 {
 }
 
 StyleSheetList::~StyleSheetList()
 {
 }
@@ skipping 45 matching lines @@
     if (!item)
         return 0;
     return item->sheet();
 }
 
 void StyleSheetList::trace(Visitor* visitor)
 {
 }
 
 } // namespace WebCore