One more factory -> default pass.

dart/tests/language/src/NamedParametersTest.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.
 // Dart test program for testing named parameters.
 
 
 class NamedParametersTest {
 
   static int F00() {
     return 0;
@@ skipping 79 matching lines @@
     Expect.equals(10200040, np.f52(10));
     Expect.equals(10203540, F41(10, c:35));
     Expect.equals(10203540, np.f52(10, c:35));
     Expect.equals(10250045, F41(10, d:45, b:25));
     Expect.equals(10250045, np.f52(10, d:45, b:25));
     Expect.equals(10253545, F41(10, d:45, c:35, b:25));
     Expect.equals(10253545, np.f52(10, d:45, c:35, b:25));
   }
 }
 
-interface I factory C {
+interface I default C {
   I();
   int mul(int a, [int factor]);
 }
 
 class C implements I {
   int mul(int a, [int factor = 10]) {
     return a * factor;
   }
 }
 
 
 main() {
   NamedParametersTest.testMain();
   var i = new I();
   Expect.equals(100, i.mul(10));
   Expect.equals(1000, i.mul(10, 100));
   var c = new C();
   Expect.equals(100, c.mul(10));
   Expect.equals(1000, c.mul(10, 100));
 }