Format all tests.

tests/language/function_subtype_null.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.
 // Dart test program for constructors and initializers.
 
 // Check function subtyping for null.
 
 import 'package:expect/expect.dart';
 
 typedef int Foo(bool a, [String b]);
 typedef int Bar<T>(T a, [String b]);
 
 main() {
   Expect.isFalse(null is Foo, 'null is Foo');
   Expect.isFalse(null is Bar<bool>, 'null is Bar<bool>');
   Expect.isFalse(null is Bar, 'null is Bar');
-}
+}