Format all tests.

tests/language/regress_21998_1_test.dart

 // Copyright (c) 2015, 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 'dart:math' as Math;
 import 'package:expect/expect.dart';
 
 main() {
   Expect.equals(4, new C().m());
 }
 
 class C {
   max(a) => a;
 
   m() {
     return max(Math.max(2, 4));
   }
-}
+}