Migrate block 162 to Dart 2.0.

tests/language_strong/type_variable_closure2_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.
-
-import "package:expect/expect.dart";
-
-class A<T> {}
-
-class C<T> {
-  a() {
-    return () => new A<T>();
-  }
-
-  list() {
-    return () => <T>[];
-  }
-
-  map() {
-    return () => <T, T>{};
-  }
-}
-
-main() {
-  Expect.isTrue(new C<int>().a()() is A<int>);
-  Expect.isFalse(new C<int>().a()() is A<String>);
-  Expect.isTrue(new C<int>().list()() is List<int>);
-  Expect.isFalse(new C<int>().list()() is List<String>);
-  Expect.isTrue(new C<int>().map()() is Map<int, int>);
-  Expect.isFalse(new C<int>().map()() is Map<String, int>);
-  Expect.isFalse(new C<int>().map()() is Map<int, String>);
-}