Remove ENTITY_REFERENCE_NODE

Source/core/dom/Node.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 11 matching lines @@
 [
     CustomToV8,
     EventTarget,
     DependentLifetime
 ] interface Node {
     // NodeType
     const unsigned short      ELEMENT_NODE                   = 1;
     const unsigned short      ATTRIBUTE_NODE                 = 2;
     const unsigned short      TEXT_NODE                      = 3;
     const unsigned short      CDATA_SECTION_NODE             = 4;
-    const unsigned short      ENTITY_REFERENCE_NODE          = 5;
+    const unsigned short      ENTITY_REFERENCE_NODE          = 5; // EntityReference nodes are impossible to create in WebKit.
     const unsigned short      ENTITY_NODE                    = 6;
     const unsigned short      PROCESSING_INSTRUCTION_NODE    = 7;
     const unsigned short      COMMENT_NODE                   = 8;
     const unsigned short      DOCUMENT_NODE                  = 9;
     const unsigned short      DOCUMENT_TYPE_NODE             = 10;
     const unsigned short      DOCUMENT_FRAGMENT_NODE         = 11;
     const unsigned short      NOTATION_NODE                  = 12;
 
     [TreatReturnedNullStringAs=Null, PerWorldBindings] readonly attribute DOMString        nodeName;
 
@@ skipping 56 matching lines @@
     [PerWorldBindings] readonly attribute Element          parentElement;
 
     void addEventListener(DOMString type, 
                           EventListener listener, 
                           optional boolean useCapture);
     void removeEventListener(DOMString type, 
                              EventListener listener, 
                              optional boolean useCapture);
     [RaisesException] boolean dispatchEvent(Event event);
 };