Nuke custom factory providers.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 2cbde772bb0464dcd76e3f674b0a07d43508e260..c4b73dac23e18c67a66825de64e12ea13c4b1a04 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -855,8 +855,6 @@ class BeforeLoadEvent extends Event {
 // 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.
 
-// WARNING: Do not edit - generated code.
-
 
 /// @domName Blob
 class Blob extends NativeFieldWrapperClass1 {
@@ -912,6 +910,7 @@ class Blob extends NativeFieldWrapperClass1 {
   Blob _slice_4() native "Blob_slice_4_Callback";
 
 }
+
 // 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.