Migrate test block 7 to Dart 2.0.

tests/corelib/double_round3_test.dart

Index: tests/corelib/double_round3_test.dart
diff --git a/tests/corelib/double_round3_test.dart b/tests/corelib/double_round3_test.dart
deleted file mode 100644
index a1edeeb77f3b7cf227e434df4add67ea47e4d865..0000000000000000000000000000000000000000
--- a/tests/corelib/double_round3_test.dart
+++ /dev/null
@@ -1,12 +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, 0.49999999999999994.round());
-  Expect.equals(0, (-0.49999999999999994).round());
-  Expect.isTrue(0.49999999999999994.round() is int);
-  Expect.isTrue((-0.49999999999999994).round() is int);
-}