[oilpan] Make the oilpan branch build on Mac.

Source/core/dom/NodeRenderingTraversal.h

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 22 matching lines @@
 namespace WebCore {
 
 class InsertionPoint;
 
 namespace NodeRenderingTraversal {
 
 class ParentDetails {
     DISALLOW_ALLOCATION()
 public:
     ParentDetails()
-        : m_insertionPoint(0)
-        , m_resetStyleInheritance(false)
+        : m_resetStyleInheritance(false)
         , m_outOfComposition(false)
     { }
 
     Result<InsertionPoint> insertionPoint() const { return m_insertionPoint; }
     bool resetStyleInheritance() const { return m_resetStyleInheritance; }
     bool outOfComposition() const { return m_outOfComposition; }
 
     void didTraverseInsertionPoint(const Handle<InsertionPoint>&);
     void didTraverseShadowRoot(const Handle<const ShadowRoot>&);
     void childWasOutOfComposition() { m_outOfComposition = true; }
@@ skipping 55 matching lines @@
     }
 
     return previousSiblingSlow(node);
 }
 
 }
 
 } // namespace WebCore
 
 #endif