[oilpan] Make the oilpan branch build on Mac.

Source/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 63 matching lines @@
 {
     ASSERT(rootNode);
     ASSERT(document);
     ASSERT(rootNode != document);
     m_rootNode->setTreeScope(Handle<TreeScope>(this));
 }
 
 TreeScope::TreeScope(const Handle<Document>& document)
     : m_rootNode(document)
     , m_documentScope(document)
-    , m_parentTreeScope(0)
     , m_idTargetObserverRegistry(IdTargetObserverRegistry::create())
 {
     ASSERT(document);
     m_rootNode->setTreeScope(Handle<TreeScope>(this));
 }
 
 TreeScope::TreeScope()
-    : m_rootNode(0)
-    , m_documentScope(0)
-    , m_parentTreeScope(0)
 {
 }
 
 TreeScope::~TreeScope()
 {
     m_rootNode->setTreeScope(noDocumentInstance());
 
     if (m_selection) {
         m_selection->clearTreeScope();
         m_selection = 0;
@@ skipping 315 matching lines @@
     return nullptr;
 }
 
 void TreeScope::visitWith(Visitor* v) const
 {
     ASSERT(this == noDocumentInstance());
     v->visit(this, &AcceptTrait<TreeScope>::accept);
 }
 
 } // namespace WebCore