Roll Observatory deps (charted -> ^0.3.0)

packages/usage/test/src/common.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.
 
 library usage.common_test;
 
 import 'dart:async';
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 import 'package:usage/src/usage_impl.dart';
 
 AnalyticsImplMock createMock({bool setOptIn: true}) =>
     new AnalyticsImplMock('UA-0', setOptIn: setOptIn);
 
 void was(Map m, String type) => expect(m['t'], type);
 void has(Map m, String key) => expect(m[key], isNotNull);
 void hasnt(Map m, String key) => expect(m[key], isNull);
 
 class AnalyticsImplMock extends AnalyticsImpl {
@@ skipping 15 matching lines @@
   MockProperties() : super('mock');
 
   dynamic operator[](String key) => props[key];
 
   void operator[]=(String key, dynamic value) {
     props[key] = value;
   }
 }
 
 class MockPostHandler extends PostHandler {
-  List<Map> sentValues = [];
+  List<Map<String, dynamic>> sentValues = [];
 
-  Future sendPost(String url, Map<String, String> parameters) {
+  Future sendPost(String url, Map<String, dynamic> parameters) {
     sentValues.add(parameters);
 
     return new Future.value();
   }
 
   Map<String, dynamic> get last => sentValues.last;
 }