Refactor Future constructors.

pkg/scheduled_test/lib/scheduled_process.dart

Index: pkg/scheduled_test/lib/scheduled_process.dart
diff --git a/pkg/scheduled_test/lib/scheduled_process.dart b/pkg/scheduled_test/lib/scheduled_process.dart
index cf37211e21c2a9bf2004b2ad314082ef64985064..45e50616dbce1f8b41a03809a47fc610a15c6460 100644
--- a/pkg/scheduled_test/lib/scheduled_process.dart
+++ b/pkg/scheduled_test/lib/scheduled_process.dart
@@ -134,9 +134,9 @@ class ScheduledProcess {
       _handleExit(exitCodeCompleter);
 
       return Future.wait([
-        new Future.of(() => executable),
+        new Future.sync(() => executable),
         awaitObject(arguments),
-        new Future.of(() => options)
+        new Future.sync(() => options)
       ]).then((results) {
         executable = results[0];
         arguments = results[1];