Oilpan: Avoid declaring a destructor for garbage collected ListHashSet.

Source/wtf/LinkedHashSet.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 159 matching lines @@
 
         Value* storedValue;
         bool isNewEntry;
     };
 
     typedef typename HashTraits<Value>::PeekInType ValuePeekInType;
 
     LinkedHashSet();
     LinkedHashSet(const LinkedHashSet&);
     LinkedHashSet& operator=(const LinkedHashSet&);
+
+    // Needs finalization. The anchor needs to unlink itself from the chain.
     ~LinkedHashSet();
 
     static void finalize(void* pointer) { reinterpret_cast<LinkedHashSet*>(pointer)->~LinkedHashSet(); }
 
     void swap(LinkedHashSet&);
 
     unsigned size() const { return m_impl.size(); }
     unsigned capacity() const { return m_impl.capacity(); }
     bool isEmpty() const { return m_impl.isEmpty(); }
 
@@ skipping 516 matching lines @@
     iterator end = set.end();
     for (iterator it = set.begin(); it != end; ++it)
         delete *it;
 }
 
 }
 
 using WTF::LinkedHashSet;
 
 #endif /* WTF_LinkedHashSet_h */