Reapply revision 11570, custom callbacks are now implemented in dartium.

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_interface_renames = {
+    'DOMFormData': 'FormData',
     'DOMWindow': 'Window',
     'WebKitAnimation': 'Animation',
     'WebKitAnimationEvent': 'AnimationEvent',
     'WebKitAnimationList': 'AnimationList',
     'WebKitBlobBuilder': 'BlobBuilder',
     'WebKitCSSKeyframeRule': 'CSSKeyframeRule',
     'WebKitCSSKeyframesRule': 'CSSKeyframesRule',
     'WebKitCSSMatrix': 'CSSMatrix',
     'WebKitCSSTransformValue': 'CSSTransformValue',
     'WebKitFlags': 'Flags',
@@ skipping 285 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