Revert "Migrating a block of dart 2:"

tests/language_2/closure5_test.dart

Index: tests/language_2/closure5_test.dart
diff --git a/tests/language_2/closure5_test.dart b/tests/language_2/closure5_test.dart
deleted file mode 100644
index bf698b65678dd2f3c6fdefce1b153e97ae37b39b..0000000000000000000000000000000000000000
--- a/tests/language_2/closure5_test.dart
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright (c) 2012, 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";
-
-// Dart2js failed when a declared function was captured inside itself.
-
-foo(f) => f(499);
-
-main() {
-  fun(x) {
-    if (x < 3) {
-      return foo((x) => fun(x));
-    } else {
-      return x;
-    }
-  }
-
-  Expect.equals(499, foo((x) => fun(x)));
-}