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

pkg/collection_helpers/lib/wrappers.dart

Index: pkg/collection_helpers/lib/wrappers.dart
diff --git a/pkg/collection_helpers/lib/wrappers.dart b/pkg/collection_helpers/lib/wrappers.dart
index 6891eb49e6096299c0ea9994fff9a8426c987ca3..3576cc032edf89718ebaa3f948aab2d0504b4dee 100644
--- a/pkg/collection_helpers/lib/wrappers.dart
+++ b/pkg/collection_helpers/lib/wrappers.dart
@@ -276,6 +276,10 @@ class DelegatingQueue<E> extends DelegatingIterable<E> implements Queue<E> {
 
   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();