Update charted to 0.4.8 and roll

packages/code_transformers/test/remove_sourcemap_comment_test.dart

Index: packages/code_transformers/test/remove_sourcemap_comment_test.dart
diff --git a/packages/code_transformers/test/remove_sourcemap_comment_test.dart b/packages/code_transformers/test/remove_sourcemap_comment_test.dart
index f4cdf332e07a3e32d10ffe07831b85dd609b599f..e34faefb6af76175a72acca4cff14bb342407503 100644
--- a/packages/code_transformers/test/remove_sourcemap_comment_test.dart
+++ b/packages/code_transformers/test/remove_sourcemap_comment_test.dart
@@ -1,13 +1,13 @@
 // 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.
-
+@TestOn('vm')
 library code_transformers.test.remove_sourcemap_comment_test;
 
 import 'package:barback/barback.dart';
 import 'package:code_transformers/src/remove_sourcemap_comment.dart';
-import 'package:code_transformers/tests.dart';
-import 'package:unittest/compact_vm_config.dart';
+import 'package:test/test.dart';
+import 'package:transformer_test/utils.dart';
 
 final phases = [
   [
@@ -17,8 +17,6 @@ final phases = [
 ];
 
 void main() {
-  useCompactVMConfiguration();
-
   testPhases('removes sourcemap comments', phases, {
     'a|web/test.js': '''
           var i = 0;