Roll to pickup pool changes

packages/barback/lib/src/utils/multiset.dart

 // Copyright (c) 2013, 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 barback.utils.multiset;
 
 import 'dart:collection';
 
 /// A set of objects where each object can appear multiple times.
 ///
@@ skipping 11 matching lines @@
   /// in the set.
   final _map = new Map<E, int>();
 
   Iterator<E> get iterator {
     return _map.keys
         .expand((element) =>
             new Iterable<E>.generate(_map[element], (_) => element))
         .iterator;
   }
 
-  Multiset()
-      : super();
+  Multiset() : super();
 
   /// Creates a multi-set and initializes it using the contents of [other].
-  Multiset.from(Iterable<E> other)
-      : super() {
+  Multiset.from(Iterable<E> other) : super() {
     other.forEach(add);
   }
 
   /// Adds [value] to the set.
   void add(E value) {
     _map.putIfAbsent(value, () => 0);
     _map[value] += 1;
   }
 
   /// Removes one copy of [value] from the set.
   ///
   /// Returns whether a copy of [value] was removed, regardless of whether more
   /// copies remain.
   bool remove(E value) {
     if (!_map.containsKey(value)) return false;
 
     _map[value] -= 1;
     if (_map[value] == 0) _map.remove(value);
     return true;
   }
 
   /// Returns whether [value] is in the set.
   bool contains(Object value) => _map.containsKey(value);
 
   /// Returns the number of copies of [value] in the set.
   int count(E value) => _map.containsKey(value) ? _map[value] : 0;
 }