Add queue.removeWhere/retainWhere to wrappers.dart as well.

pkg/collection_helpers/lib/wrappers.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.
 
 /**
  * Delegating wrappers for [Iterable], [List], [Set], [Queue] and [Map].
  *
  * Also adds unmodifiable views for `Set` and `Map`, and a fixed length
  * view for `List`. The unmodifable list view from `dart:collection` is exported
  * as well, just for completeness.
@@ skipping 258 matching lines @@
   void addLast(E value) {
     _baseQueue.addLast(value);
   }
 
   void clear() {
     _baseQueue.clear();
   }
 
   bool remove(Object object) => _baseQueue.remove(object);
 
+  void removeWhere(bool test(E element)) { _baseQueue.removeWhere(test); }
+
+  void retainWhere(bool test(E element)) { _baseQueue.retainWhere(test); }
+
   E removeFirst() => _baseQueue.removeFirst();
 
   E removeLast() => _baseQueue.removeLast();
 }
 
 /**
  * Creates a [Map] that delegates all operations to a base map.
  *
  * This class can be used hide non-`Map` methods of an object that extends
  * `Map`, or it can be extended to add extra functionality on top of an existing
@@ skipping 32 matching lines @@
   Iterable<K> get keys => _base.keys;
 
   int get length => _base.length;
 
   V putIfAbsent(K key, V ifAbsent()) => _base.putIfAbsent(key, ifAbsent);
 
   V remove(Object key) => _base.remove(key);
 
   Iterable<V> get values => _base.values;
 }