Format all tests.

tests/corelib/double_round2_test.dart

 // 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.throws(() => double.INFINITY.round(), (e) => e is UnsupportedError);
-  Expect.throws(() => double.NEGATIVE_INFINITY.round(),
-                (e) => e is UnsupportedError);
+  Expect.throws(
+      () => double.NEGATIVE_INFINITY.round(), (e) => e is UnsupportedError);
   Expect.throws(() => double.NAN.round(), (e) => e is UnsupportedError);
 }