Make Map.keys/values Iterables.

pkg/serialization/lib/src/serialization_helpers.dart

Index: pkg/serialization/lib/src/serialization_helpers.dart
diff --git a/pkg/serialization/lib/src/serialization_helpers.dart b/pkg/serialization/lib/src/serialization_helpers.dart
index 4bb7899f3152de2b16b8e7ac783156d221fc2e25..407c6562d2b765f6c5c5553e9f6e371672b3196b 100644
--- a/pkg/serialization/lib/src/serialization_helpers.dart
+++ b/pkg/serialization/lib/src/serialization_helpers.dart
@@ -29,11 +29,11 @@ List append(Iterable a, Iterable b) {
 }
 
 /**
- * Return a sorted version of [aCollection], using the default sort criterion.
- * Always returns a List, regardless of the type of [aCollection].
+ * Return a sorted version of [anIterable], using the default sort criterion.
+ * Always returns a List, regardless of the type of [anIterable].
  */
-List sorted(aCollection) {
-  var result = new List.from(aCollection);
+List sorted(anIterable) {
+  var result = new List.from(anIterable);
   result.sort();
   return result;
 }