Remove more bits of the Oilpan tracing system

sky/engine/wtf/HashSet.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 90 matching lines @@
         void clear();
         template<typename Collection>
         void removeAll(const Collection& toBeRemoved) { WTF::removeAll(*this, toBeRemoved); }
 
         static bool isValidValue(ValuePeekInType);
 
         ValuePassOutType take(iterator);
         ValuePassOutType take(ValuePeekInType);
         ValuePassOutType takeAny();
 
-        void trace(typename Allocator::Visitor* visitor) { m_impl.trace(visitor); }
-
     private:
         HashTableType m_impl;
     };
 
     struct IdentityExtractor {
         template<typename T>
         static const T& extract(const T& t) { return t; }
     };
 
     template<typename Translator>
@@ skipping 142 matching lines @@
         typedef typename C::const_iterator iterator;
 
         vector.resize(collection.size());
 
         iterator it = collection.begin();
         iterator end = collection.end();
         for (unsigned i = 0; it != end; ++it, ++i)
             vector[i] = *it;
     }
 
-#if !ENABLE(OILPAN)
-    template<typename T, typename U, typename V>
-    struct NeedsTracing<HashSet<T, U, V> > {
-        static const bool value = false;
-    };
-#endif
-
 } // namespace WTF
 
 using WTF::HashSet;
 
 #endif /* WTF_HashSet_h */