Remove more bits of the Oilpan tracing system

sky/engine/wtf/HashCountedSet.h

 /*
  * Copyright (C) 2005, 2006, 2008 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 62 matching lines @@
         bool remove(const ValueType& value) { return remove(find(value)); }
         bool remove(iterator);
 
         // Removes the value, regardless of its count.
         void removeAll(const ValueType& value) { removeAll(find(value)); }
         void removeAll(iterator);
 
         // Clears the whole set.
         void clear() { m_impl.clear(); }
 
-        void trace(typename Allocator::Visitor* visitor) { m_impl.trace(visitor); }
-
     private:
         ImplType m_impl;
     };
 
     template<typename T, typename U, typename V, typename W>
     inline typename HashCountedSet<T, U, V, W>::AddResult HashCountedSet<T, U, V, W>::add(const ValueType& value)
     {
         AddResult result = m_impl.add(value, 0);
         ++result.storedValue->value;
         return result;
@@ skipping 45 matching lines @@
         typedef typename HashCountedSet<Value, HashFunctions, Traits, Allocator>::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).key;
     }
 
-#if !ENABLE(OILPAN)
-    template<typename T, typename U, typename V>
-    struct NeedsTracing<HashCountedSet<T, U, V> > {
-        static const bool value = false;
-    };
-#endif
-
 } // namespace WTF
 
 using WTF::HashCountedSet;
 
 #endif /* WTF_HashCountedSet_h */