FINALizing of the Node hierarchy.

Source/core/html/track/WebVTTElement.h

 /*
  * Copyright (C) 2013 Apple 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 21 matching lines @@
     WebVTTNodeTypeClass,
     WebVTTNodeTypeItalic,
     WebVTTNodeTypeLanguage,
     WebVTTNodeTypeBold,
     WebVTTNodeTypeUnderline,
     WebVTTNodeTypeRuby,
     WebVTTNodeTypeRubyText,
     WebVTTNodeTypeVoice
 };
 
-class WebVTTElement : public Element {
+class WebVTTElement FINAL : public Element {
 public:
     static PassRefPtr<WebVTTElement> create(const WebVTTNodeType, Document*);
     static PassRefPtr<WebVTTElement> create(const QualifiedName&, Document*);
     PassRefPtr<HTMLElement> createEquivalentHTMLElement(Document*);
 
     virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren() OVERRIDE;
 
     void setWebVTTNodeType(WebVTTNodeType type) { m_webVTTNodeType = static_cast<unsigned>(type); }
     WebVTTNodeType webVTTNodeType() const { return static_cast<WebVTTNodeType>(m_webVTTNodeType); }
 
@@ skipping 31 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!node || node->isWebVTTElement());
     return static_cast<WebVTTElement*>(node);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toWebVTTElement(const WebVTTElement*);
 
 
 } // namespace WebCore