Revert "Merge more Kernel infrastructure from kernel_sdk SDK fork."

tests/kernel/unsorted/closures_regression_test.dart

Index: tests/kernel/unsorted/closures_regression_test.dart
diff --git a/tests/kernel/unsorted/closures_regression_test.dart b/tests/kernel/unsorted/closures_regression_test.dart
deleted file mode 100644
index ac45e1bc4caf5dba4544555da463be3b0783577c..0000000000000000000000000000000000000000
--- a/tests/kernel/unsorted/closures_regression_test.dart
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) 2016, 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 'expect.dart';
-
-f(fun) => fun();
-class A {
-  identity(arg) {
-    return f(() {
-      print(this);
-      return f(() {
-        return this;
-      });
-    });
-  }
-}
-
-main() {
-  var a = new A();
-  Expect.isTrue(identical(a.identity(42), a));
-}