Use Node.isDocumentTypeNode more

Source/core/dom/Range.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Gunnstein Lye (gunnstein@netcom.no)
  * (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 1440 matching lines @@
     if (!m_start.container()) {
         exceptionState.throwDOMException(InvalidStateError, "The range has no container. Perhaps 'detatch()' has been invoked on this object?");
         return;
     }
 
     if (!commonAncestorContainer(exceptionState) || exceptionState.hadException())
         return;
 
     Node* pastLast = pastLastNode();
     for (Node* n = firstNode(); n != pastLast; n = NodeTraversal::next(*n)) {
-        if (n->nodeType() == Node::DOCUMENT_TYPE_NODE) {
+        if (n->isDocumentTypeNode()) {
             exceptionState.throwDOMException(HierarchyRequestError, "The Range contains a doctype node.");
             return;
         }
     }
 }
 
 Node* Range::firstNode() const
 {
     if (!m_start.container())
         return 0;
@@ skipping 414 matching lines @@
 
 void showTree(const WebCore::Range* range)
 {
     if (range && range->boundaryPointsValid()) {
         range->startContainer()->showTreeAndMark(range->startContainer(), "S", range->endContainer(), "E");
         fprintf(stderr, "start offset: %d, end offset: %d\n", range->startOffset(), range->endOffset());
     }
 }
 
 #endif