Update charted to 0.4.8 and roll

packages/quiver_iterables/lib/src/partition.dart

-// Copyright 2014 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.iterables;
-
-/// Partitions the input iterable into lists of the specified size.
-Iterable<List> partition(Iterable iterable, int size) {
-  if (size <= 0) throw new ArgumentError(size);
-  return _partition(iterable, size);
-}
-
-Iterable<List> _partition(Iterable iterable, int size) sync* {
-  if (iterable.isEmpty) return;
-  var iterator = iterable.iterator;
-  iterator.moveNext();
-  var first = iterator.current;
-  while (true) {
-    var part = [first];
-    for (var i = 0; i < size - 1; i++) {
-      if (!iterator.moveNext()) {
-        yield part;
-        return;
-      }
-      part.add(iterator.current);
-    }
-    yield part;
-    if (iterator.moveNext()) {
-      first = iterator.current;
-    } else {
-      return;
-    }
-  }
-}