dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/bailout_aborting_if_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.
 
 import "package:expect/expect.dart";
 
-bar() => {'bar' : 21};
+bar() => {'bar': 21};
 foo() => 'bar';
 
 main() {
   var f = foo();
   // The following code will bailout because bar() does not return an array.
   int a = bar()[f];
   // The aborting if.
   if (a == 42) {
     Expect.fail('Should not enter here');
     return;
   }
   Expect.equals(21, a);
 }