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

Source/core/css/SelectorChecker.h

Index: Source/core/css/SelectorChecker.h
diff --git a/Source/core/css/SelectorChecker.h b/Source/core/css/SelectorChecker.h
index a22cb00d0744a0841a85ddb39a99be43c4ab30bf..2ca27e237fadeb59ee3aa3c90a72a2c303693832 100644
--- a/Source/core/css/SelectorChecker.h
+++ b/Source/core/css/SelectorChecker.h
@@ -55,12 +55,14 @@ public:
     };
 
     struct SelectorCheckingContext {
+        STACK_ALLOCATED();
+    public:
         // Initial selector constructor
         SelectorCheckingContext(const CSSSelector& selector, Element* element, VisitedMatchType visitedMatchType)
             : selector(&selector)
             , element(element)
-            , previousElement(0)
-            , scope(0)
+            , previousElement(nullptr)
+            , scope(nullptr)
             , visitedMatchType(visitedMatchType)
             , pseudoId(NOPSEUDO)
             , elementStyle(0)
@@ -71,12 +73,13 @@ public:
             , hasSelectionPseudo(false)
             , isUARule(false)
             , contextFlags(DefaultBehavior)
-        { }
+        {
+        }
 
         const CSSSelector* selector;
-        Element* element;
-        Element* previousElement;
-        const ContainerNode* scope;
+        RawPtrWillBeMember<Element> element;
+        RawPtrWillBeMember<Element> previousElement;
+        RawPtrWillBeMember<const ContainerNode> scope;
         VisitedMatchType visitedMatchType;
         PseudoId pseudoId;
         RenderStyle* elementStyle;