Migrating a block of dart 1 tests to dart 2

tests/language_strong/closure_in_field_initializer_test.dart

Index: tests/language_strong/closure_in_field_initializer_test.dart
diff --git a/tests/language_strong/closure_in_field_initializer_test.dart b/tests/language_strong/closure_in_field_initializer_test.dart
deleted file mode 100644
index 026c712f46b8eaa2ebcab1e3c6d5aa49a4154dda..0000000000000000000000000000000000000000
--- a/tests/language_strong/closure_in_field_initializer_test.dart
+++ /dev/null
@@ -1,14 +0,0 @@
-// 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 Foo {
-  var closures = {'a': (int x, int y) => x + y};
-}
-
-main() {
-  var closures = new Foo().closures;
-  Expect.equals(6, closures['a'](4, 2));
-}