Combine unmodifiable_collection package into collection_helpers.

pkg/collection_helpers/lib/all.dart

Index: pkg/collection_helpers/lib/all.dart
diff --git a/pkg/collection_helpers/lib/all.dart b/pkg/collection_helpers/lib/all.dart
index 9f38d91d00a2d3af77a08c85777c58ab905e0af3..3658cf1a4b8ba2f2231db06b23fffb0e402c62c0 100644
--- a/pkg/collection_helpers/lib/all.dart
+++ b/pkg/collection_helpers/lib/all.dart
@@ -8,10 +8,11 @@
  * The sub-libraries of this package are:
  *
  * - `algorithms.dart`: Algorithms that work on lists (shuffle, binary search
- *   and various sorting algorithms).
- * - `wrappers.dart`: Wrapper classes that delegate to a collection object.
+ *                      and various sorting algorithms).
  * - `equality.dart`: Different notions of equality of collections.
  * - `typed_buffers.dart`: Growable typed data lists.
+ * - `wrappers.dart`: Wrapper classes that delegate to a collection object.
+ *                    Includes unmodifiable views of collections.
  */
 library dart.collection_helper;