Update charted to 0.4.8 and roll

packages/quiver/lib/src/collection/delegates/map.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,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 part of quiver.collection;
 
-/**
- * An implementation of [Map] that delegates all methods to another [Map].
- * For instance you can create a FruitMap like this :
- *
- *     class FruitMap extends DelegatingMap<String, Fruit> {
- *       final Map<String, Fruit> _fruits = {};
- *
- *       Map<String, Fruit> get delegate => _fruits;
- *
- *       // custom methods
- *     }
- */
+/// An implementation of [Map] that delegates all methods to another [Map].
+/// For instance you can create a FruitMap like this :
+///
+///     class FruitMap extends DelegatingMap<String, Fruit> {
+///       final Map<String, Fruit> _fruits = {};
+///
+///       Map<String, Fruit> get delegate => _fruits;
+///
+///       // custom methods
+///     }
 abstract class DelegatingMap<K, V> implements Map<K, V> {
   Map<K, V> get delegate;
 
   V operator [](Object key) => delegate[key];
 
   void operator []=(K key, V value) {
     delegate[key] = value;
   }
 
   void addAll(Map<K, V> other) => delegate.addAll(other);
@@ skipping 13 matching lines @@
   Iterable<K> get keys => delegate.keys;
 
   int get length => delegate.length;
 
   V putIfAbsent(K key, V ifAbsent()) => delegate.putIfAbsent(key, ifAbsent);
 
   V remove(Object key) => delegate.remove(key);
 
   Iterable<V> get values => delegate.values;
 }