One more factory -> default pass.

dart/tests/language/src/ConstConstructor1NegativeTest.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.
 // Check that class allocated via 'const' has a const constructor.
 
-interface I factory C {
+interface I default C {
   I(int i);
 }
 
 class C implements I {
   C(int this.i) {}  // <- missing const constructor.
   final int i;
 }
 
 
 class ConstConstructor1NegativeTest {
   static testMain() {
     var i = const I(5);
     print("Expected compilation failure: ${i.i}");
   }
 }
 
 main() {
   ConstConstructor1NegativeTest.testMain();
 }