Update DOM classes to use OVERRIDE / FINAL when needed

Source/core/dom/FullscreenElementStack.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 28 matching lines @@
 
 namespace WebCore {
 
 class Document;
 class Element;
 class Node;
 class RenderFullScreen;
 class RenderStyle;
 class ExecutionContext;
 
-class FullscreenElementStack
+class FullscreenElementStack FINAL
     : public DocumentSupplement
     , public DocumentLifecycleObserver {
 public:
     virtual ~FullscreenElementStack();
     static const char* supplementName();
     static FullscreenElementStack* from(Document*);
     static FullscreenElementStack* fromIfExists(Document*);
     static Element* fullscreenElementFrom(Document*);
     static Element* currentFullScreenElementFrom(Document*);
     static bool isFullScreen(Document*);
@@ skipping 67 matching lines @@
 inline FullscreenElementStack* FullscreenElementStack::fromIfExists(Document* document)
 {
     if (!document->hasFullscreenElementStack())
         return 0;
     return fromIfExistsSlow(document);
 }
 
 } // namespace WebCore
 
 #endif // FullscreenElementStack_h