Oilpan: Replace RefPtrs to Node and its subclasses in core/xml/ with Oilpan transition types.

Source/core/xml/DOMParser.h

 /*
  *  Copyright (C) 2003, 2006 Apple Computer, Inc.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser 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,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 19 matching lines @@
 class Document;
 class ExceptionState;
 
 class DOMParser : public RefCountedWillBeGarbageCollectedFinalized<DOMParser>, public ScriptWrappable {
 public:
     static PassRefPtrWillBeRawPtr<DOMParser> create()
     {
         return adoptRefWillBeNoop(new DOMParser);
     }
 
-    PassRefPtr<Document> parseFromString(const String&, const String& contentType, ExceptionState&);
+    PassRefPtrWillBeRawPtr<Document> parseFromString(const String&, const String& contentType, ExceptionState&);
 
     void trace(Visitor*) { }
 
 private:
     DOMParser()
     {
         ScriptWrappable::init(this);
     }
 };
 
 }
 
 #endif // XMLSerializer.h