Migrate test block 5 to Dart 2.0.

tests/corelib_strong/date_time3_test.dart

Index: tests/corelib_strong/date_time3_test.dart
diff --git a/tests/corelib_strong/date_time3_test.dart b/tests/corelib_strong/date_time3_test.dart
deleted file mode 100644
index 557eedee15fde73a37da728fef633214dd6d2548..0000000000000000000000000000000000000000
--- a/tests/corelib_strong/date_time3_test.dart
+++ /dev/null
@@ -1,14 +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";
-
-// At some point dart was emitting a bad padding 0 for Dates where the ms were
-// ending with 10.
-
-main() {
-  String s = "2012-01-30 08:30:00.010";
-  DateTime d = DateTime.parse(s);
-  Expect.equals(s, d.toString());
-}