Remove ENABLE(OILPAN) uses in wtf/

third_party/WebKit/Source/wtf/ListHashSet.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, Benjamin Poulain <ikipou@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 1016 matching lines @@
 template <typename VisitorDispatcher>
 void ListHashSet<T, inlineCapacity, U, V>::trace(VisitorDispatcher visitor)
 {
     static_assert(HashTraits<T>::weakHandlingFlag == NoWeakHandlingInCollections, "ListHashSet does not support weakness");
     // This marks all the nodes and their contents live that can be accessed
     // through the HashTable. That includes m_head and m_tail so we do not have
     // to explicitly trace them here.
     m_impl.trace(visitor);
 }
 
-#if !ENABLE(OILPAN)
-template <typename T, size_t U, typename V>
-struct NeedsTracing<ListHashSet<T, U, V>> {
-    static const bool value = false;
-};
-#endif
-
 } // namespace WTF
 
 using WTF::ListHashSet;
 
 #endif // WTF_ListHashSet_h