Remove Unused measure DocumentTypeEntities

Source/core/dom/NamedNodeMap.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2010, 2013 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
@@ skipping 50 matching lines @@
 
     PassRefPtr<Node> item(unsigned index) const;
     size_t length() const;
 
     Element* element() const { return m_element; }
 
 private:
     explicit NamedNodeMap(Element* element)
         : m_element(element)
     {
-        // Only supports NamedNodeMaps with Element associated, DocumentType.entities and DocumentType.notations are not supported yet.
+        // Only supports NamedNodeMaps with Element associated.
         ASSERT(m_element);
         ScriptWrappable::init(this);
     }
 
     Element* m_element;
 };
 
 } // namespace WebCore
 
 #endif // NamedNodeMap_h