Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/RefCountedSupplement.h

 /*
  * Copyright (C) 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
 namespace WebCore {
 
 template<class T, class S>
 class RefCountedSupplement : public RefCounted<S> {
 public:
     typedef RefCountedSupplement<T, S> ThisType;
 
     virtual ~RefCountedSupplement() { }
     virtual void hostDestroyed() { }
 
-    class Wrapper : public Supplement<T> {
+    class Wrapper FINAL : public Supplement<T> {
     public:
         explicit Wrapper(PassRefPtr<ThisType> wrapped) : m_wrapped(wrapped) { }
         virtual ~Wrapper() { m_wrapped->hostDestroyed();  }
 #if !ASSERT_DISABLED || defined(ADDRESS_SANITIZER)
         virtual bool isRefCountedWrapper() const OVERRIDE { return true; }
 #endif
         ThisType* wrapped() const { return m_wrapped.get(); }
     private:
 
         RefPtr<ThisType> m_wrapped;
@@ skipping 10 matching lines @@
         if (!found)
             return 0;
         ASSERT_WITH_SECURITY_IMPLICATION(found->isRefCountedWrapper());
         return static_cast<Wrapper*>(found)->wrapped();
     }
 };
 
 } // namespace WebCore
 
 #endif // RefCountedSupplement_h