One more factory -> default pass.

dart/tests/language/src/InterfaceFactory2NegativeTest.dart

 // Copyright (c) 2011, 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.
 //
 // Test that a "factory provider" interface factory only
 // provides the constructors declared in the interface.
 
-interface Interface factory FactoryProvider {
+interface Interface default FactoryProvider {
   Interface.some_name(var secret);
 }
 
 class SomeImplementation implements Interface {
   SomeImplementation() {}
 }
 
 class FactoryProvider {
   factory Interface.some_name() {
     return new SomeImplementation();
   }
 
   factory Interface.wrong_name() {
     return new SomeImplementation();
   }
 
   static testMain() {
     // We should not be able to find Interface1.wrong_name().
     new Interface.wrong_name();
   }
 }
 
 main() {
   FactoryProvider.testMain();
 }