pkg/scheduled_test fixed shelf dependency

pkg/scheduled_test/test/scheduled_server_test.dart

 // Copyright (c) 2013, 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.
 
 library scheduled_server_test;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:http/http.dart' as http;
@@ skipping 173 matching lines @@
     var server = new ScheduledServer();
     expect(server.url.then((url) => http.read(url.resolve('/hello'))),
         completion(equals('Hello, test!')));
 
     server.handle('GET', '/hello', (request) => fail('oh no'));
   }, 'oh no');
 }
 
 /// Creates a metatest that runs [testBody], captures its schedule errors, and
 /// asserts that it throws an error with the given [errorMessage].
-void expectServerError(String description, void testBody(),
+void expectServerError(String description, testBody(),
     String errorMessage) {
   expectTestFails(description, testBody, (errors) {
     // There can be between one and three errors here. The first is the
     // expected server error. The second is an HttpException that may occur if
     // the server is closed fast enough after the error. The third is due to
     // issue 9151: the HttpException is reported without a stack trace, and so
     // when it's wrapped twice it registers as a different exception each time
     // (because it's given an ad-hoc stack trace).
     expect(errors.length, inInclusiveRange(1, 3));
     expect(errors[0].error.toString(), equals(errorMessage));
 
     for (var i = 1; i < errors.length; i++) {
       expect(errors[i].error, new isInstanceOf<HttpException>());
     }
   });
 }