Remove internalSubset from DocumentType

Source/core/dom/Node.cpp

 /*
  * 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, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1290 matching lines @@
 
     if (isDocumentTypeNode()) {
         const DocumentType* documentTypeThis = toDocumentType(this);
         const DocumentType* documentTypeOther = toDocumentType(other);
 
         if (documentTypeThis->publicId() != documentTypeOther->publicId())
             return false;
 
         if (documentTypeThis->systemId() != documentTypeOther->systemId())
             return false;
-
-        if (documentTypeThis->internalSubset() != documentTypeOther->internalSubset())
-            return false;
     }
 
     return true;
 }
 
 bool Node::isDefaultNamespace(const AtomicString& namespaceURIMaybeEmpty) const
 {
     const AtomicString& namespaceURI = namespaceURIMaybeEmpty.isEmpty() ? nullAtom : namespaceURIMaybeEmpty;
 
     switch (nodeType()) {
@@ skipping 1269 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif