Update charted to 0.4.8 and roll

packages/usage/test/web_test.dart

Index: packages/usage/test/web_test.dart
diff --git a/packages/usage/test/web_test.dart b/packages/usage/test/web_test.dart
index 5a9cd9815daebae05012c80da5f347f365f106e8..8d91ae9980ec1be13e2af5fe051d597970482555 100644
--- a/packages/usage/test/web_test.dart
+++ b/packages/usage/test/web_test.dart
@@ -6,6 +6,7 @@
 library usage.web_test;
 
 import 'dart:async';
+import 'dart:html';
 
 import 'package:test/test.dart';
 import 'package:usage/src/usage_impl_html.dart';
@@ -22,32 +23,34 @@ void main() {
   usage_impl_test.defineTests();
   uuid_test.defineTests();
 
-  // Define some web specfic tests.
+  // Define some web specific tests.
   defineWebTests();
 }
 
 void defineWebTests() {
   group('HtmlPostHandler', () {
-    test('sendPost', () {
+    test('sendPost', () async {
       MockRequestor client = new MockRequestor();
-      HtmlPostHandler postHandler = new HtmlPostHandler(
-          mockRequestor: client.request);
-      Map args = {'utv': 'varName', 'utt': 123};
-      return postHandler.sendPost('http://www.google.com', args).then((_) {
-        expect(client.sendCount, 1);
-      });
+      HtmlPostHandler postHandler =
+          new HtmlPostHandler(mockRequestor: client.request);
+      Map<String, dynamic> args = {'utv': 'varName', 'utt': 123};
+
+      await postHandler.sendPost('http://www.google.com', args);
+      expect(client.sendCount, 1);
     });
   });
 
   group('HtmlPersistentProperties', () {
     test('add', () {
-      HtmlPersistentProperties props = new HtmlPersistentProperties('foo_props');
+      HtmlPersistentProperties props =
+          new HtmlPersistentProperties('foo_props');
       props['foo'] = 'bar';
       expect(props['foo'], 'bar');
     });
 
     test('remove', () {
-      HtmlPersistentProperties props = new HtmlPersistentProperties('foo_props');
+      HtmlPersistentProperties props =
+          new HtmlPersistentProperties('foo_props');
       props['foo'] = 'bar';
       expect(props['foo'], 'bar');
       props['foo'] = null;
@@ -59,7 +62,7 @@ void defineWebTests() {
 class MockRequestor {
   int sendCount = 0;
 
-  Future request(String url, {String method, String sendData}) {
+  Future<HttpRequest> request(String url, {String method, sendData}) {
     expect(url, isNotEmpty);
     expect(method, isNotEmpty);
     expect(sendData, isNotEmpty);