- Fix outdated use of factory clause.

vm/snapshot_test.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.
 
 class Fields  {
   Fields(int i, int j) : fld1 = i, fld2 = j, fld5 = true {}
   int fld1;
   final int fld2;
   static int fld3;
   static final int fld4 = 10;
@@ skipping 1243 matching lines @@
     }
     Expect.equals(true, encounteredException);
 
     this.port.receive((ignored, replyTo) {
       replyTo.send("foo", null);
       this.port.close();
     });
   }
 }
 
-interface Mint factory MintImpl {
+interface Mint default MintImpl {
 
   Mint();
 
   Purse createPurse(int balance);
 
 }
 
 
 class MintImpl implements Mint {
 
@@ skipping 914 matching lines @@
       });
     });
   }
 
   void main() {
     this.port.receive((ignored, replyTo) {
       replyTo.send("foo", null);
     });
   }
 }