Make test work with Dartium.

tests/language/regress_28278_test.dart

 // Copyright (c) 2017, 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.
 // VMOptions=--load-deferred-eagerly
 // VMOptions=
 
 import "package:expect/expect.dart";
 
 import "regress_28278_lib.dart" deferred as def;
 
 var result = "";
 
 class D {
   m() async {
     await def.loadLibrary();
     result = def.foo(result += "Here");
   }
 
 }
 
-main(args) async {
+main() async {
   var d = new D();
   await d.m();
   await d.m();
   Expect.equals("HereHelloHereHello", result);
 }