Update or delete language tests using obsolete interfaces or default factory

tests/language/library_same_name_used_test.dart

Index: tests/language/library_same_name_used_test.dart
===================================================================
--- tests/language/library_same_name_used_test.dart	(revision 15648)
+++ tests/language/library_same_name_used_test.dart	(working copy)
@@ -1,9 +1,9 @@
-// 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.
 
-// 'X' is defined as an interface in lib1 and a class implementing that
-// interface in lib2.  Use of import prefixes should allow this.
+// 'X' is defined as an abstract class in lib1 and a class implementing that
+// abstract class in lib2.  Use of import prefixes should allow this.
 
 library main;
 import "library_same_name_used_lib1.dart";