Revert "Migrating a block of dart 2:"

tests/language_2/closure_parameter_types_test.dart

Index: tests/language_2/closure_parameter_types_test.dart
diff --git a/tests/language_2/closure_parameter_types_test.dart b/tests/language_2/closure_parameter_types_test.dart
deleted file mode 100644
index 3fa1521fcb129276fe6b0fc95b1750b38f3e714f..0000000000000000000000000000000000000000
--- a/tests/language_2/closure_parameter_types_test.dart
+++ /dev/null
@@ -1,27 +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";
-
-// Regression test for dart2js, where the optimizer was too aggressive
-// about parameter types of closures.
-
-class A {
-  Function f;
-  A(this.f);
-  _do() => f(1);
-}
-
-main() {
-  int invokeCount = 0;
-  closure(a) {
-    if (invokeCount++ == 1) {
-      Expect.isTrue(a is int);
-    }
-  }
-
-  closure('s');
-  new A(closure)._do();
-  Expect.equals(2, invokeCount);
-}