dart2js: run dartfmt on tests

tests/compiler/dart2js/indentation_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:compiler/src/util/util.dart' show Indentation;
 
 main() {
   Indentation ind = new Indentation();
 
@@ skipping 13 matching lines @@
   Expect.stringEquals("xx", ind.indentation);
 
   ind.indentLess();
   Expect.stringEquals("x", ind.indentation);
 
   ind.indentLess();
   Expect.stringEquals("", ind.indentation);
 
   ind.indentMore();
   Expect.stringEquals("x", ind.indentation);
-}
+}