Update DOM classes to use OVERRIDE / FINAL when needed

Source/core/dom/NamedFlowCollection.h

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. 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.
@@ skipping 25 matching lines @@
 #include "wtf/ListHashSet.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class Document;
 class DOMNamedFlowCollection;
 
-class NamedFlowCollection : public RefCounted<NamedFlowCollection>, public DocumentLifecycleObserver {
+class NamedFlowCollection FINAL : public RefCounted<NamedFlowCollection>, public DocumentLifecycleObserver {
 public:
     static PassRefPtr<NamedFlowCollection> create(Document* doc) { return adoptRef(new NamedFlowCollection(doc)); }
 
     Vector<RefPtr<NamedFlow> > namedFlows();
     NamedFlow* flowByName(const AtomicString&);
     PassRefPtr<NamedFlow> ensureFlowWithName(const AtomicString&);
 
     void discardNamedFlow(NamedFlow*);
 
     Document* document() const;
 
     virtual ~NamedFlowCollection() { }
 
     PassRefPtr<DOMNamedFlowCollection> createCSSOMSnapshot();
 
 private:
     struct NamedFlowHashFunctions;
     struct NamedFlowHashTranslator;
 
     typedef ListHashSet<NamedFlow*, 1, NamedFlowHashFunctions> NamedFlowSet;
 
     explicit NamedFlowCollection(Document*);
 
     NamedFlowSet m_namedFlows;
 };
 
 } // namespace WebCore
 
 #endif // NamedFlowCollection_h