Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

Source/core/dom/Attr.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2012 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
@@ skipping 57 matching lines @@
     attr->createTextChild();
     return attr.release();
 }
 
 Attr::~Attr()
 {
 }
 
 void Attr::createTextChild()
 {
+#if !ENABLE(OILPAN)
     ASSERT(refCount());
+#endif
     if (!value().isEmpty()) {
         RefPtr<Text> textNode = document().createTextNode(value().string());
 
         // This does everything appendChild() would do in this situation (assuming m_ignoreChildrenChanged was set),
         // but much more efficiently.
         textNode->setParentOrShadowHostNode(this);
         treeScope().adoptIfNeeded(*textNode);
         setFirstChild(textNode.get());
         setLastChild(textNode.get());
     }
@@ skipping 108 matching lines @@
 }
 
 void Attr::attachToElement(Element* element)
 {
     ASSERT(!m_element);
     m_element = element;
     m_standaloneValue = nullAtom;
 }
 
 }