Update charted to 0.4.8 and roll

packages/code_transformers/test/unique_message_test.dart

 // Copyright (c) 2014, 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.
 
 /// Tests for some of the utility helper functions used by the compiler.
+@TestOn('vm')
 library polymer.test.build.messages_test;
 
 import 'dart:mirrors';
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 import 'package:code_transformers/messages/messages.dart' show Message;
 
 import 'package:code_transformers/src/messages.dart' as p1;
 
 /// [p1] is accessed via mirrors, this comment prevents the analyzer from
 /// complaining about it.
 main() {
   test('each message id is unique', () {
     var seen = {};
     int total = 0;
     var mirrors = currentMirrorSystem();
     var lib = mirrors.findLibrary(#code_transformers.src.messages);
     expect(lib, isNotNull);
     lib.declarations.forEach((symbol, decl) {
       if (decl is! VariableMirror) return;
       var field = lib.getField(symbol).reflectee;
       var name = MirrorSystem.getName(symbol);
       if (field is! Message) return;
       var id = field.id;
-      expect(seen.containsKey(id), isFalse, reason: 'Duplicate id `$id`. '
-          'Currently set for both `$name` and `${seen[id]}`.');
+      expect(seen.containsKey(id), isFalse,
+          reason: 'Duplicate id `$id`. '
+              'Currently set for both `$name` and `${seen[id]}`.');
       seen[id] = name;
       total++;
     });
     expect(seen.length, total);
   });
 }