Stop having HTMLNameCollection override HTMLCollection::virtualItemAfter()

Source/core/html/DocumentNameCollection.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DocumentNameCollection_h
+#define DocumentNameCollection_h
+
+#include "HTMLNameCollection.h"
+
+namespace WebCore {
+
+class DocumentNameCollection FINAL : public HTMLNameCollection {
+public:
+    static PassRefPtrWillBeRawPtr<DocumentNameCollection> create(ContainerNode& document, CollectionType type, const AtomicString& name)
+    {
+        ASSERT_UNUSED(type, type == DocumentNamedItems);

[adamk, 2014/06/03 20:20:55]

Seems like we might want to add a new addCache() method to avoid passing type
around unnecessarily, now that so many types have dedicated classes that go with
them. But maybe further duplication in NodeRareData.h isn't worth it?

+        return adoptRefWillBeNoop(new DocumentNameCollection(document, name));
+    }
+
+    bool elementMatches(const Element&) const;
+
+private:
+    DocumentNameCollection(ContainerNode& document, const AtomicString& name);
+};
+
+DEFINE_TYPE_CASTS(DocumentNameCollection, LiveNodeListBase, collection, collection->type() == DocumentNamedItems, collection.type() == DocumentNamedItems);
+
+} // namespace WebCore
+
+#endif // DocumentNameCollection_h