pkg/watcher: prepare for 0.9.3

pkg/watcher/test/ready/shared.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:scheduled_test/scheduled_test.dart';
 
 import '../utils.dart';
 
-sharedTests() {
+void sharedTests() {
   test('ready does not complete until after subscription', () {
     var watcher = createWatcher(waitForReady: false);
 
     var ready = false;
     watcher.ready.then((_) {
       ready = true;
     });
 
     // Should not be ready yet.
     schedule(() {
@@ skipping 69 matching lines @@
         ready = true;
       });
     });
 
     // Should be back to not ready.
     schedule(() {
       expect(ready, isFalse);
     });
   });
 }