dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/if_in_loop_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";
 
 // Test for bug in code generation of if-with-aborting-branch-inside-loop.
 
 foo(p, q) {
   var w = 10;
   do {
     if (p) {
       w = 20;
     } else {
       w = 30;
       return w;
     }
   } while (q);
   return w;
 }
 
 main() {
   Expect.equals(30, foo(false, true));
   Expect.equals(30, foo(false, false));
   Expect.equals(20, foo(true, false));
-}
+}