Update charted to 0.4.8 and roll

packages/intl/test/find_default_locale_browser_test.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.
 
+@TestOn("browser")
 library find_default_locale_browser_test;
 
 import 'package:intl/intl.dart';
 import 'package:intl/intl_browser.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 main() {
   test("Find system locale in browser", () {
     // TODO (alanknight): This only verifies that we found some locale. We
     // should find a way to force the system locale before the test is run
     // and then verify that it's actually the correct value.
     Intl.systemLocale = 'xx_YY';
-    var callback = expectAsync(verifyLocale);
+    ThenArgument callback = expectAsync(verifyLocale) as ThenArgument;
     findSystemLocale().then(callback);
   });
 }
 
+typedef ThenArgument(String _);
+
 verifyLocale(_) {
   expect(Intl.systemLocale, isNot(equals("xx_YY")));
   // Allow either en_US or just en type locales. Windows in particular may
   // give us just ru for ru_RU
   var pattern = new RegExp(r"\w\w_[A-Z0-9]+");
   var shortPattern = new RegExp(r"\w\w");
   var match = pattern.hasMatch(Intl.systemLocale);
   var shortMatch = shortPattern.hasMatch(Intl.systemLocale);
   expect(match || shortMatch, isTrue);
 }