Revert "Fix null.runtimeType, reflect(null).type.superinterfaces, and reflect(null).getField."

tests/lib/mirrors/null2_test.dart

Index: tests/lib/mirrors/null2_test.dart
diff --git a/tests/lib/mirrors/null2_test.dart b/tests/lib/mirrors/null2_test.dart
deleted file mode 100644
index 4c5590d398f9ad7f7d251438ffbb1e3f2104c6cc..0000000000000000000000000000000000000000
--- a/tests/lib/mirrors/null2_test.dart
+++ /dev/null
@@ -1,16 +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.
-
-library test.null_test;
-
-import 'dart:mirrors';
-
-import 'package:expect/expect.dart';
-
-main() {
-  InstanceMirror nullMirror = reflect(null);
-  for (int i = 0; i < 10; i++) {
-    Expect.isTrue(nullMirror.getField(#hashCode).reflectee is int);
-  }
-}