Update charted to 0.4.8 and roll

packages/utf/lib/src/list_range.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 utf.list_range;
 
 import 'dart:collection';
 
 /**
  * _ListRange in an internal type used to create a lightweight Interable on a
  * range within a source list. DO NOT MODIFY the underlying list while
  * iterating over it. The results of doing so are undefined.
  */
 // TODO(floitsch): Consider removing the extend and switch to implements since
 // that's cheaper to allocate.
-class ListRange extends IterableBase {
-  final List _source;
+class ListRange extends IterableBase<int> {
+  final List<int> _source;
   final int _offset;
   final int _length;
 
-  ListRange(source, [offset = 0, length]) :
-      this._source = source,
-      this._offset = offset,
-      this._length = (length == null ? source.length - offset : length) {
+  ListRange(List<int> source, [offset = 0, length])
+      : this._source = source,
+        this._offset = offset,
+        this._length = (length == null ? source.length - offset : length) {
     if (_offset < 0 || _offset > _source.length) {
       throw new RangeError.value(_offset);
     }
     if (_length != null && (_length < 0)) {
       throw new RangeError.value(_length);
     }
     if (_length + _offset > _source.length) {
       throw new RangeError.value(_length + _offset);
     }
   }
@@ skipping 35 matching lines @@
   void backup([int by = 1]) {
     _offset -= by;
   }
 
   int get remaining => _end - _offset - 1;
 
   void skip([int count = 1]) {
     _offset += count;
   }
 }