Oilpan: Replace Node* pointers with Member<Node>s

Source/core/css/SelectorChecker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 916 matching lines @@
                     do {
                         MatchResult subResult;
                         hostContext.element = nextElement;
                         if (match(hostContext, siblingTraversalStrategy, &subResult) == SelectorMatches) {
                             matched = true;
                             // Consider div:host(div:host(div:host(div:host...))).
                             maxSpecificity = std::max(maxSpecificity, hostContext.selector->specificity() + subResult.specificity);
                             break;
                         }
                         hostContext.contextFlags = DefaultBehavior;
-                        hostContext.scope = 0;
+                        hostContext.scope = nullptr;
 
                         if (selector.pseudoType() == CSSSelector::PseudoHost)
                             break;
 
                         hostContext.elementStyle = 0;
                         nextElement = NodeRenderingTraversal::parentElement(nextElement);
                     } while (nextElement);
                 }
                 if (matched) {
                     if (specificity)
@@ skipping 181 matching lines @@
     return isHTMLOptionElement(element) && toHTMLOptionElement(element).spatialNavigationFocused() && isFrameFocused(element);
 }
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const DOMSiblingTraversalStrategy&, MatchResult*) const;
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const ShadowDOMSiblingTraversalStrategy&, MatchResult*) const;
 
 }