dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/conditional_test.dart

 // Copyright (c) 2011, 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";
 
-getZero() { return 0; }
+getZero() {
+  return 0;
+}
 
 main() {
   int i = getZero();
   int c = i == 0 ? i-- : i++;
   Expect.equals(-1, i);
   Expect.equals(0, c);
 
   int d = i == 0 ? i-- : i++;
   Expect.equals(0, i);
   Expect.equals(-1, d);
 
   int e = i == 0 ? --i : ++i;
   Expect.equals(-1, i);
   Expect.equals(-1, e);
 }