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

Source/core/dom/NameNodeList.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2007m 2008 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 20 matching lines @@
 
 // NodeList which lists all Nodes in a Element with a given "name" attribute
 class NameNodeList final : public LiveNodeList {
 public:
     static PassRefPtrWillBeRawPtr<NameNodeList> create(ContainerNode& rootNode, CollectionType type, const AtomicString& name)
     {
         ASSERT_UNUSED(type, type == NameNodeListType);
         return adoptRefWillBeNoop(new NameNodeList(rootNode, name));
     }
 
-    virtual ~NameNodeList();
+    ~NameNodeList() override;
 
 private:
     NameNodeList(ContainerNode& rootNode, const AtomicString& name);
 
-    virtual bool elementMatches(const Element&) const override;
+    bool elementMatches(const Element&) const override;
 
     AtomicString m_name;
 };
 
 } // namespace blink
 
 #endif // NameNodeList_h