Update or delete language tests using obsolete interfaces or default factory

tests/language/interface_factory2_negative_test.dart

Index: tests/language/interface_factory2_negative_test.dart
===================================================================
--- tests/language/interface_factory2_negative_test.dart	(revision 15648)
+++ tests/language/interface_factory2_negative_test.dart	(working copy)
@@ -1,33 +0,0 @@
-// 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" interface factory only
-// provides the constructors declared in the interface.
-
-interface Interface default FactoryProvider {
-  Interface.some_name(var secret);
-}
-
-class SomeImplementation implements Interface {
-  SomeImplementation() {}
-}
-
-class FactoryProvider {
-  factory Interface.some_name() {
-    return new SomeImplementation();
-  }
-
-  factory Interface.wrong_name() {
-    return new SomeImplementation();
-  }
-
-  static testMain() {
-    // We should not be able to find Interface1.wrong_name().
-    new Interface.wrong_name();
-  }
-}
-
-main() {
-  FactoryProvider.testMain();
-}