dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/closure_type_reflection_test.dart

 // Copyright (c) 2014, 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.
 
 // Test that classes referenced from a signature of a tear-off closure
 // are emitted.
 
 @MirrorsUsed(targets: 'C', symbols: 'A')
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
 
 class A {}
 
 class C {
   A foo() {}
 }
 
 main() {
   Expect.equals("ClassMirror on 'A'",
-                reflect(new C().foo).function.returnType.toString());
+      reflect(new C().foo).function.returnType.toString());
 }