test rename overhaul: step 8 - language tests

tests/language/interface_factory_multi_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.
 //
 
 // Test that a factory provider can provide for more than one interface.
 
 interface A default F {
   A(var secret);
 
@@ skipping 31 matching lines @@
 
   factory B(var secret) {
     return new BImpl(secret, 'B');
   }
 }
 
 main() {
   Expect.equals('1A', new A('1').GetSecret());
   Expect.equals('B2', new B('2').GetSecret());
 }