Update charted to 0.4.8 and roll

packages/unittest/test/test_common.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.
 
 library unittest.matcher.test_common;
 
 import 'dart:collection';
 
 import 'package:unittest/unittest.dart';
 
 class Widget {
   int price;
 }
 
 class HasPrice extends CustomMatcher {
   HasPrice(matcher) : super("Widget with a price that is", "price", matcher);
   featureValueOf(actual) => actual.price;
 }
 
 class SimpleIterable extends IterableBase<int> {
   final int count;
 
   SimpleIterable(this.count);
 
-  bool contains(int val) => count < val ? false : true;
+  bool contains(Object val) => val is int && val <= count;
 
   bool any(bool f(element)) {
     for (var i = 0; i <= count; i++) {
       if (f(i)) return true;
     }
     return false;
   }
 
   String toString() => "<[$count]>";
 
-  Iterator get iterator {
+  Iterator<int> get iterator {
     return new _SimpleIterator(count);
   }
 }
 
 class _SimpleIterator implements Iterator<int> {
   int _count;
   int _current;
 
   _SimpleIterator(this._count);
 
   bool moveNext() {
     if (_count > 0) {
       _current = _count;
       _count--;
       return true;
     }
     _current = null;
     return false;
   }
 
   int get current => _current;
 }