pkg: analysis aided cleanup

pkg/watcher/test/ready_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 'dart:async';
-import 'dart:io';
 
 import 'package:scheduled_test/scheduled_test.dart';
-import 'package:watcher/watcher.dart';
 
 import 'utils.dart';
 
 main() {
   initConfig();
 
   setUp(createSandbox);
 
   test('ready does not complete until after subscription', () {
     var watcher = createWatcher(waitForReady: false);
@@ skipping 77 matching lines @@
         ready = true;
       });
     });
 
     // Should be back to not ready.
     schedule(() {
       expect(ready, isFalse);
     });
   });
 }