Revert revision 11570, this still has dartium failures.

lib/dom/dom.dart

Index: lib/dom/dom.dart
===================================================================
--- lib/dom/dom.dart	(revision 11575)
+++ lib/dom/dom.dart	(working copy)
@@ -27,13 +27,6 @@
 // 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.
 
-class _DOMFormDataFactoryProvider {
-  factory DOMFormData([FormElement form]) => _dummy();
-}
-// 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.
-
 class _DOMParserFactoryProvider {
   factory DOMParser() => _dummy();
 }
@@ -1539,10 +1532,8 @@
 
 // WARNING: Do not edit - generated code.
 
-interface FormData default _FormDataFactoryProvider {
+interface FormData {
 
-  FormData([FormElement form]);
-
   void append(String name, String value, String filename);
 }