Migrate block 162 to Dart 2.0.

tests/language_strong/type_variable_function_type_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';
-
-typedef T Func<T>();
-
-class Foo<S> {
-  m(x) => x is Func<S>;
-}
-
-class Bar<T> {
-  f() {
-    T local() {}
-    return local;
-  }
-}
-
-void main() {
-  var x = new Foo<List<String>>();
-  if (new DateTime.now().millisecondsSinceEpoch == 42) x = new Foo<int>();
-  Expect.isFalse(x.m(new Bar<String>().f()));
-  Expect.isTrue(x.m(new Bar<List<String>>().f()));
-}