Update charted to 0.4.8 and roll

packages/async/test/future_group_test.dart

 // Copyright (c) 2015, 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 'package:async/src/future_group.dart';
 import 'package:test/test.dart';
 
 import 'utils.dart';
@@ skipping 169 matching lines @@
       expect(futureGroup.isIdle, isTrue);
     });
 
     test("emits an event when the group closes", () async {
       // It's important that the order of events here stays consistent over
       // time, since code may rely on it in subtle ways.
       var idle = false;
       var onIdleDone = false;
       var futureFired = false;
 
-      futureGroup.onIdle.listen(expectAsync((_) {
+      futureGroup.onIdle.listen(expectAsync1((_) {
         expect(futureFired, isFalse);
         idle = true;
-      }), onDone: expectAsync(() {
+      }), onDone: expectAsync0(() {
         expect(idle, isTrue);
         expect(futureFired, isFalse);
         onIdleDone = true;
       }));
 
-      futureGroup.future.then(expectAsync((_) {
+      futureGroup.future.then(expectAsync1((_) {
         expect(idle, isTrue);
         expect(onIdleDone, isTrue);
         futureFired = true;
       }));
 
       var completer = new Completer();
       futureGroup.add(completer.future);
       futureGroup.close();
 
       await flushMicrotasks();
       expect(idle, isFalse);
       expect(futureGroup.isIdle, isFalse);
 
       completer.complete();
       await flushMicrotasks();
       expect(idle, isTrue);
       expect(futureGroup.isIdle, isTrue);
       expect(futureFired, isTrue);
     });
   });
 }