Oilpan: Remove support for tracing of off-heap ListHashSets.

Source/platform/heap/Visitor.h

Index: Source/platform/heap/Visitor.h
diff --git a/Source/platform/heap/Visitor.h b/Source/platform/heap/Visitor.h
index 3060194e9b7d7f36a9f1a8a9bb9c82bd022cbfe4..0d7df1bb3d3f259af8e00bdfa202eb1a5d029fe2 100644
--- a/Source/platform/heap/Visitor.h
+++ b/Source/platform/heap/Visitor.h
@@ -304,12 +304,6 @@ public:
         OffHeapCollectionTraceTrait<HashSet<T, U, V> >::trace(this, hashSet);
     }
 
-    template<typename T, size_t inlineCapacity, typename U>
-    void trace(const ListHashSet<T, inlineCapacity, U>& hashSet)
-    {
-        OffHeapCollectionTraceTrait<ListHashSet<T, inlineCapacity, U> >::trace(this, hashSet);
-    }
-
     template<typename T, size_t N>
     void trace(const Deque<T, N>& deque)
     {
@@ -470,20 +464,6 @@ struct OffHeapCollectionTraceTrait<WTF::HashSet<T, HashFunctions, Traits, WTF::D
     }
 };
 
-template<typename T, size_t inlineCapacity, typename HashFunctions>
-struct OffHeapCollectionTraceTrait<ListHashSet<T, inlineCapacity, HashFunctions> > {
-    typedef WTF::ListHashSet<T, inlineCapacity, HashFunctions> ListHashSet;
-
-    static void trace(Visitor* visitor, const ListHashSet& set)
-    {
-        if (set.isEmpty())
-            return;
-        ListHashSet& iterSet = const_cast<ListHashSet&>(set);
-        for (typename ListHashSet::iterator it = iterSet.begin(), end = iterSet.end(); it != end; ++it)
-            visitor->trace(*it);
-    }
-};
-
 template<typename Key, typename Value, typename HashFunctions, typename KeyTraits, typename ValueTraits>
 struct OffHeapCollectionTraceTrait<WTF::HashMap<Key, Value, HashFunctions, KeyTraits, ValueTraits, WTF::DefaultAllocator> > {
     typedef WTF::HashMap<Key, Value, HashFunctions, KeyTraits, ValueTraits, WTF::DefaultAllocator> HashMap;