Fix virtual/override/final usage in Source/core/html/.

Source/core/html/HTMLTableSectionElement.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 29 matching lines @@
     PassRefPtrWillBeRawPtr<HTMLElement> insertRow(int index, ExceptionState&);
     void deleteRow(int index, ExceptionState&);
 
     int numRows() const;
 
     PassRefPtrWillBeRawPtr<HTMLCollection> rows();
 
 private:
     HTMLTableSectionElement(const QualifiedName& tagName, Document&);
 
-    virtual const StylePropertySet* additionalPresentationAttributeStyle() override;
+    const StylePropertySet* additionalPresentationAttributeStyle() override;
 };
 
 inline bool isHTMLTableSectionElement(const HTMLElement& element)
 {
     return element.hasTagName(HTMLNames::tbodyTag) || element.hasTagName(HTMLNames::tfootTag) || element.hasTagName(HTMLNames::theadTag);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLTableSectionElement);
 
 } // namespace blink
 
 #endif // HTMLTableSectionElement_h