dart2js: run dartfmt on tests

tests/compiler/dart2js/closure_codegen_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.
 // Test that parameters keep their names in the output.
 
 import 'dart:async';
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'compiler_helper.dart';
 
@@ skipping 49 matching lines @@
 Future closureBailout(bool minify, String prefix) {
   return compileAll(TEST_BAILOUT, minify: minify).then((generated) {
     RegExp regexp = new RegExp("$prefix\\\$0:${minify ? "" : " "}function");
     Iterator<Match> matches = regexp.allMatches(generated).iterator;
     checkNumberOfMatches(matches, 1);
   });
 }
 
 main() {
   asyncTest(() => Future.wait([
-    closureInvocation(false, "call"),
-    closureInvocation(true, ""),
-    closureBailout(false, "call"),
-    closureBailout(true, ""),
-  ]));
+        closureInvocation(false, "call"),
+        closureInvocation(true, ""),
+        closureBailout(false, "call"),
+        closureBailout(true, ""),
+      ]));
 }