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

Source/core/xml/NativeXPathNSResolver.cpp

 /*
  * Copyright (C) 2007 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #include "config.h"
 #include "core/xml/NativeXPathNSResolver.h"
 
 #include "XMLNames.h"
 #include "core/dom/Node.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-NativeXPathNSResolver::NativeXPathNSResolver(PassRefPtr<Node> node)
+NativeXPathNSResolver::NativeXPathNSResolver(PassRefPtrWillBeRawPtr<Node> node)
     : m_node(node)
 {
 }
 
 NativeXPathNSResolver::~NativeXPathNSResolver()
 {
 }
 
 AtomicString NativeXPathNSResolver::lookupNamespaceURI(const String& prefix)
 {
     // This is not done by Node::lookupNamespaceURI as per the DOM3 Core spec,
     // but the XPath spec says that we should do it for XPathNSResolver.
     if (prefix == "xml")
         return XMLNames::xmlNamespaceURI;
 
     return m_node ? m_node->lookupNamespaceURI(prefix) : nullAtom;
 }
 
 void NativeXPathNSResolver::trace(Visitor* visitor)
 {
+    visitor->trace(m_node);
     XPathNSResolver::trace(visitor);
 }
 
 } // namespace WebCore