Update charted to 0.4.8 and roll

packages/observe/benchmark/setup_observable_list_benchmark.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 observe.test.benchmark.setup_observable_list_benchmark;
-
-import 'package:observe/observe.dart';
-import 'setup_observation_benchmark_base.dart';
-
-class SetupObservableListBenchmark extends SetupObservationBenchmarkBase {
-  final int elementCount = 100;
-
-  SetupObservableListBenchmark(int objectCount, String config) : super(
-          'SetupObservableListBenchmark:$objectCount:$config', objectCount,
-          config);
-
-  @override
-  ObservableList newObject() {
-    var list = new ObservableList();
-    for (int i = 0; i < elementCount; i++) {
-      list.add(i);
-    }
-    list.deliverChanges();
-    list.deliverListChanges();
-    return list;
-  }
-}