restore dirName. It was added in html5

lib/html/scripts/htmlrenamer.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 html_interface_renames = {
     'DOMCoreException': 'DOMException',
     'DOMFormData': 'FormData',
     'DOMWindow': 'LocalWindow',
     'History': 'LocalHistory',
@@ skipping 197 matching lines @@
     "Element.get:itemProp",
     'Element.scrollIntoView',
     'Element.get:classList',
     "FormElement.get:elements",
     "HTMLFrameElement.*",
     "HTMLFrameSetElement.*",
     "HtmlElement.version",
     "HtmlElement.manifest",
     "Document.version",
     "Document.manifest",
-    "InputElement.dirName",
     "HTMLIsIndexElement.*",
     "HTMLOptionsCollection.*",
     "HTMLPropertiesCollection.*",
     "SelectElement.remove",
-    "TextAreaElement.dirName",
     "NamedNodeMap.*",
     "Node.isEqualNode",
     "Node.get:TEXT_NODE",
     "Node.hasAttributes",
     "Node.get:DOCUMENT_TYPE_NODE",
     "Node.get:DOCUMENT_POSITION_FOLLOWING",
     "Node.lookupNamespaceURI",
     "Node.get:ELEMENT_NODE",
     "Node.get:namespaceURI",
     "Node.get:DOCUMENT_FRAGMENT_NODE",
@@ skipping 67 matching lines @@
 
   def _FindMatch(self, interface, member, member_prefix, candidates):
     for interface in self._database.Hierarchy(interface):
       html_interface_name = self.RenameInterface(interface)
       member_name = html_interface_name + '.' + member
       if member_name in candidates:
         return member_name
       member_name = html_interface_name + '.' + member_prefix + member
       if member_name in candidates:
         return member_name