dart2js: run dartfmt on tests

tests/compiler/dart2js/list_tracer_length_test.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.
 
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 import 'compiler_helper.dart';
 
 const String TEST1 = r"""
 var a = [42];
@@ skipping 71 matching lines @@
 const String TEST9 = r"""
 const b = 42;
 var a = new List(b);
 main() {
   return a[1];
 }
 """;
 
 void checkRangeError(String test, {bool hasRangeError}) {
   asyncTest(() => compileAll(test).then((generated) {
-    Expect.equals(hasRangeError, generated.contains('ioore'));
-  }));
+        Expect.equals(hasRangeError, generated.contains('ioore'));
+      }));
 }
 
 main() {
   checkRangeError(TEST1, hasRangeError: false);
   checkRangeError(TEST2('insert', 'null, null'), hasRangeError: true);
   checkRangeError(TEST2('add', 'null'), hasRangeError: true);
   checkRangeError(TEST2('clear', ''), hasRangeError: true);
   checkRangeError(TEST2('toString', ''), hasRangeError: false);
   checkRangeError(TEST3, hasRangeError: false);
   checkRangeError(TEST4, hasRangeError: true);
   checkRangeError(TEST5, hasRangeError: true);
   checkRangeError(TEST6, hasRangeError: true);
   checkRangeError(TEST7, hasRangeError: false);
   checkRangeError(TEST8, hasRangeError: true);
   checkRangeError(TEST9, hasRangeError: false);
 }