Update heap/ classes to use OVERRIDE / FINAL when needed

Source/heap/Handle.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 54 matching lines @@
     PersistentNode* m_prev;
 
     template<ThreadAffinity affinity, typename Owner> friend class PersistentBase;
     friend class PersistentAnchor;
     friend class ThreadState;
 };
 
 template<ThreadAffinity Affinity, typename Owner>
 class PersistentBase : public PersistentNode {
 public:
     ~PersistentBase()

[Mads Ager (chromium), 2014/01/14 07:26:43]

Don't you want virtual here as well?

     {
 #ifndef NDEBUG
         m_threadState->checkThread();
 #endif
         m_next->m_prev = m_prev;
         m_prev->m_next = m_next;
     }
 
 protected:
     inline PersistentBase()
@@ skipping 42 matching lines @@
 #endif
 };
 
 // A dummy Persistent handle that ensures the list of persistents is never null.
 // This removes a test from a hot path.
 class PersistentAnchor : public PersistentNode {
 public:
     void trace(Visitor*) { }
 
 private:
-    ~PersistentAnchor() { }
+    virtual ~PersistentAnchor() { }
     PersistentAnchor() : PersistentNode(TraceMethodDelegate<PersistentAnchor, &PersistentAnchor::trace>::trampoline)
     {
         m_next = this;
         m_prev = this;
     }
 
     friend class ThreadState;
 };
 
 // Persistent handles are used to store pointers into the
@@ skipping 379 matching lines @@
 };
 
 template<typename Key, typename Value, typename Extractor, typename Traits, typename KeyTraits>
 struct IsWeak<WebCore::HeapHashTableBacking<Key, Value, Extractor, Traits, KeyTraits> > {
     static const bool value = Traits::isWeak;
 };
 
 } // namespace WTF
 
 #endif