Update charted to 0.4.8 and roll

packages/matcher/lib/src/error_matchers.dart

 // Copyright (c) 2012, 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 matcher.error_matchers;
-
 import 'core_matchers.dart';
 import 'interfaces.dart';
 
 /// A matcher for ArgumentErrors.
 const Matcher isArgumentError = const _ArgumentError();
 
 class _ArgumentError extends TypeMatcher {
   const _ArgumentError() : super("ArgumentError");
   bool matches(item, Map matchState) => item is ArgumentError;
 }
@@ skipping 71 matching lines @@
   bool matches(item, Map matchState) => item is UnimplementedError;
 }
 
 /// A matcher for UnsupportedError.
 const Matcher isUnsupportedError = const _UnsupportedError();
 
 class _UnsupportedError extends TypeMatcher {
   const _UnsupportedError() : super("UnsupportedError");
   bool matches(item, Map matchState) => item is UnsupportedError;
 }