Update or delete language tests using obsolete interfaces or default factory

tests/language/interface_injection1_negative_test.dart

Index: tests/language/interface_injection1_negative_test.dart
===================================================================
--- tests/language/interface_injection1_negative_test.dart	(revision 15648)
+++ tests/language/interface_injection1_negative_test.dart	(working copy)
@@ -1,10 +1,10 @@
-// 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.
 
-interface S { }
-interface I { }
-interface I extends S;
+abstract class S { }
+abstract class I { }
+abstract class I implements S;
 
 class C implements I { }