Update charted to 0.4.8 and roll

packages/unittest/lib/html_config.dart

 // 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.
 
 /// A simple unit test library for running tests in a browser.
 library unittest.html_config;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:html';
@@ skipping 122 matching lines @@
 
   void processMessage(e) {
     if ('unittest-suite-external-error' == e.data) {
       handleExternalError('<unknown>', '(external error detected)');
     }
   }
 
   void onInit() {
     // For Dart internal tests, we want to turn off stack frame
     // filtering, which we do with this meta-header.
-    var meta = querySelector('meta[name="dart.unittest"]');
+    MetaElement meta = querySelector('meta[name="dart.unittest"]');
     filterStacks =
         meta == null ? true : !meta.content.contains('full-stack-traces');
     _installHandlers();
     window.postMessage('unittest-suite-wait-for-done', '*');
   }
 
   void onStart() {
     // If the URL has a #testFilter=testName then filter tests to that.
     // This is used to make it easy to run a single test- but is only intended
     // for interactive debugging scenarios.
@@ skipping 21 matching lines @@
     window.postMessage('unittest-suite-done', '*');
   }
 }
 
 void useHtmlConfiguration([bool isLayoutTest = false]) {
   unittestConfiguration = isLayoutTest ? _singletonLayout : _singletonNotLayout;
 }
 
 final _singletonLayout = new HtmlConfiguration(true);
 final _singletonNotLayout = new HtmlConfiguration(false);