One more factory -> default pass.

dart/tests/language/src/ClassTest.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.
 
 // Tests basic classes and methods.
 class ClassTest {
   ClassTest() {}
 
   static testMain() {
     var test = new ClassTest();
@@ skipping 69 matching lines @@
     x = new Inter.named();
     Expect.equals(43, x.methodX());
     Expect.equals(84, x.methodK());
 
     x = new Inter.factory();
     Expect.equals(43, x.methodX());
     Expect.equals(84, x.methodK());
   }
 }
 
-interface Inter factory Sup {
+interface Inter default Sup {
   Inter.named();
   Inter.fromInt(int x);
   Inter(int x);
   Inter.factory();
   int methodX();
   int methodK();
   int x_;
 }
 
 class Sup implements Inter {
@@ skipping 60 matching lines @@
   }
 
   Sub() : super(42) {
     y_ = 0;
   }
 }
 
 main() {
   ClassTest.testMain();
 }