Oilpan:Allow custom handling of classes that contain weak pointers that are embedded in collections.

Source/wtf/LinkedHashSet.h

Index: Source/wtf/LinkedHashSet.h
diff --git a/Source/wtf/LinkedHashSet.h b/Source/wtf/LinkedHashSet.h
index eb235d4ee7de6cfe8608ece4834bc1e339b0c443..d9668a800182de801e4912d02aaecb0bb28b0058 100644
--- a/Source/wtf/LinkedHashSet.h
+++ b/Source/wtf/LinkedHashSet.h
@@ -307,7 +307,7 @@ struct LinkedHashSetTraits : public SimpleClassHashTraits<LinkedHashSetNode<Valu
     static const bool emptyValueIsZero = true;
 
     static const bool hasIsEmptyValueFunction = true;
-    static bool isEmptyValue(const Node& value) { return !value.m_next; }
+    static bool isEmptyValue(const Node& node) { return !node.m_next; }
 
     static const int deletedValue = -1;
 
@@ -324,7 +324,12 @@ struct LinkedHashSetTraits : public SimpleClassHashTraits<LinkedHashSetNode<Valu
     struct NeedsTracingLazily {
         static const bool value = ValueTraits::template NeedsTracingLazily<>::value;
     };
-    static const bool isWeak = ValueTraits::isWeak;
+    static const WeakHandlingFlag weakHandlingFlag = ValueTraits::weakHandlingFlag;
+    template<typename Visitor>
+    static bool shouldRemoveFromCollection(Visitor* visitor, LinkedHashSetNode<Value>& node)
+    {
+        return ValueTraits::shouldRemoveFromCollection(visitor, node.m_value);
+    }
 };
 
 template<typename LinkedHashSetType>
@@ -670,11 +675,6 @@ inline void LinkedHashSet<T, U, V, W>::remove(ValuePeekInType value)
     remove(find(value));
 }
 
-template<typename T>
-struct IsWeak<LinkedHashSetNode<T> > {
-    static const bool value = IsWeak<T>::value;
-};
-
 inline void swap(LinkedHashSetNodeBase& a, LinkedHashSetNodeBase& b)
 {
     swap(a.m_prev, b.m_prev);