Oilpan: add transition types to shadow DOM supporting objects.

Source/core/css/SelectorChecker.cpp

Index: Source/core/css/SelectorChecker.cpp
diff --git a/Source/core/css/SelectorChecker.cpp b/Source/core/css/SelectorChecker.cpp
index cc023da531c544ca9e7c6c5304e925a22c7c647a..b8a819d117756398efa137f262152eaba560680e 100644
--- a/Source/core/css/SelectorChecker.cpp
+++ b/Source/core/css/SelectorChecker.cpp
@@ -380,7 +380,7 @@ template<typename SiblingTraversalStrategy>
 SelectorChecker::Match SelectorChecker::matchForShadowDistributed(const Element* element, const SiblingTraversalStrategy& siblingTraversalStrategy, SelectorCheckingContext& nextContext, MatchResult* result) const
 {
     ASSERT(element);
-    Vector<InsertionPoint*, 8> insertionPoints;
+    WillBeHeapVector<RawPtrWillBeMember<InsertionPoint>, 8> insertionPoints;
 
     const ContainerNode* scope = nextContext.scope;
     BehaviorAtBoundary behaviorAtBoundary = nextContext.behaviorAtBoundary;