Update or delete language tests using obsolete interfaces or default factory

tests/language/non_parameterized_factory_test.dart

Index: tests/language/non_parameterized_factory_test.dart
===================================================================
--- tests/language/non_parameterized_factory_test.dart	(revision 15648)
+++ tests/language/non_parameterized_factory_test.dart	(working copy)
@@ -1,20 +1,18 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, 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.
 
-// The list of type parameters in the default factory clause can be omitted.
-
-interface Interface<T> default Factory {
-  Interface();
-  Interface.withArg(T value);
+abstract class Interface<T> {
+  factory Interface() = Factory<T>;
+  factory Interface.withArg(T value) = Factory<T>.withArg;
 }
 
 class Factory<T> {
-  factory Interface() {
+  factory Factory() {
     return null;
   }
 
-  factory Interface.withArg(value) {
+  factory Factory.withArg(value) {
     return null;
   }
 }