Migrate block 162 to Dart 2.0.

tests/language/type_variable_initializer_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file

[eernst, 2017/09/04 17:04:58]

Lost coverage: don't delete this 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";
-
-// Regression test for dart2js where the reference to [:this:] in a
-// constructor was not propagated to the super initializers.
-
-class A<T> {
-  var map;
-  // Usage of type variables in the initializer makes the SSA builder
-  // want to access [:this:]. And because the initializers of A are
-  // inlined in the constructor of B, we have to make sure the
-  // [:this:] in the A constructor has a corresponding
-  // SSA instruction.
-  A() : map = new Map<T, T>();
-}
-
-class B<T> extends A<T> {}
-
-main() {
-  Expect.isTrue(new B<int>().map is Map<int, int>);
-}