[oilpan] Make the oilpan branch build on Mac.

Source/core/css/StyleResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 399 matching lines @@
     // FIXME(oilpan): We should create a visitable HashMap.
     typedef HashMap<CSSPropertyID, Persistent<CSSValue> > PendingImagePropertyMap;
 #if ENABLE(SVG)
     typedef HashMap<FilterOperation*, Persistent<WebKitCSSSVGDocumentValue> > PendingSVGDocumentMap;
 #endif
 
     class State {
         WTF_MAKE_NONCOPYABLE(State);
     public:
         State()
-        : m_element(0)
-        , m_parentNode(0)
+        : m_parentNode(0)
         , m_parentStyle(0)
         , m_rootElementStyle(0)
         , m_regionForStyling(0)
         , m_elementLinkState(NotInsideLink)
         , m_distributedToInsertionPoint(false)
         , m_elementAffectedByClassRules(false)
         , m_applyPropertyToRegularStyle(true)
         , m_applyPropertyToVisitedLinkStyle(false)
         , m_hasPendingShaders(false)
         , m_lineHeightValue(nullptr)
@@ skipping 226 matching lines @@
         PseudoId ignoreDynamicPseudo = NOPSEUDO;
         if (selectorChecker.match(selectorCheckingContext, ignoreDynamicPseudo, DOMSiblingTraversalStrategy()) == SelectorChecker::SelectorMatches)
             return true;
     }
     return false;
 }
 
 } // namespace WebCore
 
 #endif // StyleResolver_h