Migrate test block 7 to Dart 2.0.

tests/corelib/double_round_to_double2_test.dart

Index: tests/corelib/double_round_to_double2_test.dart
diff --git a/tests/corelib/double_round_to_double2_test.dart b/tests/corelib/double_round_to_double2_test.dart
deleted file mode 100644
index ef8024db0338efc9f1c83ac91d501cfd3cd88be0..0000000000000000000000000000000000000000
--- a/tests/corelib/double_round_to_double2_test.dart
+++ /dev/null
@@ -1,13 +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.
-
-import 'package:expect/expect.dart';
-
-main() {
-  Expect.equals(0.0, 0.49999999999999994.roundToDouble());
-  Expect.equals(0.0, (-0.49999999999999994).roundToDouble());
-  Expect.isTrue(0.49999999999999994.roundToDouble() is double);
-  Expect.isTrue((-0.49999999999999994).roundToDouble().isNegative);
-  Expect.isTrue((-0.49999999999999994).roundToDouble() is double);
-}