dart2js: run dartfmt on tests

tests/compiler/dart2js/boolify_test.dart

 // Copyright (c) 2012, 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.
 
 library boolify_test;
 
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'compiler_helper.dart';
 
 const String TEST = r"""
 foo() {
   var a = foo();
   if (!a) return 1;
   return 2;
 }
 """;
 
 main() {
   asyncTest(() => compile(TEST, entry: 'foo', check: (String generated) {
-    Expect.isTrue(generated.contains('foo() !== true)'));
-  }));
+        Expect.isTrue(generated.contains('foo() !== true)'));
+      }));
 }