Switch to using expectAsync0() to address some deprecation warnings.

pkg/analyzer_plugin/test/integration/support/integration_tests.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.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:analyzer_plugin/protocol/protocol_generated.dart';
@@ skipping 701 matching lines @@
       // We're already dealing with it.
       return;
     }
     _receivedBadDataFromServer = true;
     debugStdio();
     // Give the server 1 second to continue outputting bad data before we kill
     // the test.  This is helpful if the server has had an unhandled exception
     // and is outputting a stacktrace, because it ensures that we see the
     // entire stacktrace.  Use expectAsync() to prevent the test from
     // ending during this 1 second.
-    new Future.delayed(new Duration(seconds: 1), expectAsync(() {
+    new Future.delayed(new Duration(seconds: 1), expectAsync0(() {
       fail('Bad data received from server: $details');
     }));
   }
 
   /**
    * Record a message that was exchanged with the server, and print it out if
    * [debugStdio] has been called.
    */
   void _recordStdio(String line) {
     double elapsedTime = currentElapseTime;
@@ skipping 217 matching lines @@
   void populateMismatches(item, List<MismatchDescriber> mismatches);
 
   /**
    * Create a [MismatchDescriber] describing a mismatch with a simple string.
    */
   MismatchDescriber simpleDescription(String description) =>
       (Description mismatchDescription) {
         mismatchDescription.add(description);
       };
 }