Update class and interface cycle tests

tests/language/interface_cycle_negative_test.dart

-// 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.
-// Check fail because of cycles in super interface relationship.
-
-abstract class C implements B {
-
-}
-
-abstract class A implements B {
-
-}
-
-abstract class B implements A {
-
-}
-
-class InterfaceCycleNegativeTest {
-  static testMain() {
-  }
-}
-
-main() {
-  InterfaceCycleNegativeTest.testMain();
-}