Removed another test from lib/mirrors that has already been migrated to lib_2/mirrors.

tests/lib/mirrors/circular_factory_redirection_test.dart

-// Copyright (c) 2013, 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.
-
-library lib;
-
-@MirrorsUsed(targets: "lib")
-import "dart:mirrors";
-import "package:expect/expect.dart";
-
-class A {
-  A();
-  factory A.circular() = B.circular;
-  const factory A.circular2() = B.circular2;
-}
-
-class B implements A {
-  B();
-  factory B.circular() = C.circular;
-  const factory B.circular2() = C.circular2;
-}
-
-class C implements B {
-  const C();
-  factory C.circular()
-  /* //# 01: compile-time error
-       = C;
-  */ = A.circular; //# 01: continued
-
-  const factory C.circular2()
-  /* //# 02: compile-time error
-       = C;
-  */ = A.circular2; //# 02: continued
-}
-
-main() {
-  ClassMirror cm = reflectClass(A);
-
-  new A.circular();
-  new A.circular2();
-}