Enable document.implementation as it is useful when implementing a web components polyfill among ot…

lib/dom/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_strip_webkit_prefix_classes = [
     'Animation',
     'AnimationEvent',
     'AnimationList',
     'BlobBuilder',
@@ skipping 104 matching lines @@
 #    "Blob.webkitSlice",
 #    "CDATASection.*",
 #    "Comment.*",
 #    "DOMImplementation.*",
     "Document.get:forms",
 #    "Document.get:selectedStylesheetSet",
 #    "Document.set:selectedStylesheetSet",
 #    "Document.get:preferredStylesheetSet",
     "Document.get:links",
     "Document.set:domain",
-    "Document.get:implementation",
     "Document.createAttributeNS",
     "Document.get:inputEncoding",
     "Document.get:height",
     "Document.get:width",
     "Element.getElementsByTagNameNS",
     "Document.get:compatMode",
     "Document.importNode",
     "Document.evaluate",
     "Document.get:images",
     "Document.createExpression",
@@ skipping 164 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