Update charted to 0.4.8 and roll

packages/quiver/test/mirrors_test.dart

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 58 matching lines @@
           new isInstanceOf<MethodMirror>());
       expect(getDeclaration(mirror, const Symbol('a')),
           new isInstanceOf<VariableMirror>());
     });
   });
 
   group('Method', () {
     test('should be callable', () {
       var i = 2;
       var mirror = reflect(i);
-      var method = new Method(mirror, const Symbol('+'));
+      var method = new Method(mirror, const Symbol('+')) as dynamic;
       expect(method(3), 5);
     });
 
     test('should be callable with named arguments', () {
       // this test will fail when named argument support is added
       var i = [1, 2];
       var mirror = reflect(i);
-      var method = new Method(mirror, const Symbol('toList'));
+      var method = new Method(mirror, const Symbol('toList')) as dynamic;
       expect(method(growable: false), [1, 2]);
     });
   });
 }
 
 class Foo extends IterableBase implements Comparable {
   String a;
   get iterator => null;
   int compareTo(o) => 0;
 }