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

Source/core/dom/LiveNodeList.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, 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 23 matching lines @@
 namespace blink {
 
 class Element;
 
 class LiveNodeList : public NodeList, public LiveNodeListBase {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(LiveNodeList);
 public:
     LiveNodeList(ContainerNode& ownerNode, CollectionType collectionType, NodeListInvalidationType invalidationType, NodeListRootType rootType = NodeListIsRootedAtNode)
         : LiveNodeListBase(ownerNode, rootType, invalidationType, collectionType) { }
 
-    virtual unsigned length() const override final;
-    virtual Element* item(unsigned offset) const override final;
+    unsigned length() const final;
+    Element* item(unsigned offset) const final;
     virtual bool elementMatches(const Element&) const = 0;
 
-    virtual void invalidateCache(Document* oldDocument = 0) const override final;
+    void invalidateCache(Document* oldDocument = 0) const final;
     void invalidateCacheForAttribute(const QualifiedName*) const;
 
     // Collection IndexCache API.
     bool canTraverseBackward() const { return true; }
     Element* traverseToFirst() const;
     Element* traverseToLast() const;
     Element* traverseForwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const;
     Element* traverseBackwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
-    virtual Node* virtualOwnerNode() const override final;
+    Node* virtualOwnerNode() const final;
 
     mutable CollectionItemsCache<LiveNodeList, Element> m_collectionItemsCache;
 };
 
 DEFINE_TYPE_CASTS(LiveNodeList, LiveNodeListBase, list, isLiveNodeListType(list->type()), isLiveNodeListType(list.type()));
 
 inline void LiveNodeList::invalidateCacheForAttribute(const QualifiedName* attrName) const
 {
     if (!attrName || shouldInvalidateTypeOnAttributeChange(invalidationType(), *attrName))
         invalidateCache();
 }
 
 } // namespace blink
 
 #endif // LiveNodeList_h