dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/27199_test.dart

 // Copyright (c) 2016, 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.
 
 // Regression test for http://dartbug.com/27199 in --checked mode.
 
 // Typedefs must be unaliased at some point before codegen to have the correct
 // number of references.  The unaliased type of ItemListFilter<T> has two
 // references to T: (Iterable<T>) -> Iterable<T>.
 
 import 'package:expect/expect.dart';
 
 typedef Iterable<T> ItemListFilter<T>(Iterable<T> items);
 
 class C<T> {
   Map<String, ItemListFilter<T>> f = {};
 }
 
-@NoInline() @AssumeDynamic()
+@NoInline()
+@AssumeDynamic()
 confuse(x) => x;
 
 main() {
   var c = new C();
   var a = 12;
   if (confuse(true)) a = {};
   c.f = a;
 }