pkg: analysis aided cleanup

pkg/scheduled_test/lib/src/scheduled_server/handler.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.handler;
 
 import 'dart:async';
-import 'dart:io';
 
 import '../../scheduled_server.dart';
 import '../../scheduled_test.dart';
 import '../utils.dart';
 
 /// A handler for a single request to a [ScheduledServer].
 class Handler {
   /// The server for which this handler will handle a request.
   final ScheduledServer server;
 
@@ skipping 54 matching lines @@
   Future _waitForTask() {
     return pumpEventQueue().then((_) {
       if (currentSchedule.currentTask != _taskBefore) return;
       // If we're one task before the handler was scheduled, wait for that
       // task to complete and pump the event queue so that [ready] will be
       // set.
       return _taskBefore.result.then((_) => pumpEventQueue());
     });
   }
 }