Update charted to 0.4.8 and roll

packages/observe/benchmark/setup_object_benchmark.dart

Index: packages/observe/benchmark/setup_object_benchmark.dart
diff --git a/packages/observe/benchmark/setup_object_benchmark.dart b/packages/observe/benchmark/setup_object_benchmark.dart
deleted file mode 100644
index 6fda9fc9cb82b3fe6b0310c51df92e57c3793364..0000000000000000000000000000000000000000
--- a/packages/observe/benchmark/setup_object_benchmark.dart
+++ /dev/null
@@ -1,15 +0,0 @@
-// 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_object_benchmark;
-
-import 'setup_observation_benchmark_base.dart';
-import 'test_observable.dart';
-
-class SetupObjectBenchmark extends SetupObservationBenchmarkBase {
-  SetupObjectBenchmark(int objectCount, String config)
-      : super('SetupObjectBenchmark:$objectCount:$config', objectCount, config);
-
-  @override
-  TestObservable newObject() => new TestObservable();
-}