Reapply "Rename mappedBy to map."

sdk/lib/collection_dev/list.dart

Index: sdk/lib/collection_dev/list.dart
diff --git a/sdk/lib/collection_dev/list.dart b/sdk/lib/collection_dev/list.dart
index ba9407ed71130256a7cda87d27610e629d6cc527..09d6deb238b7962704f38020b6e965fcd18d2a86 100644
--- a/sdk/lib/collection_dev/list.dart
+++ b/sdk/lib/collection_dev/list.dart
@@ -93,6 +93,10 @@ abstract class ListBase<E> extends Collection<E> implements List<E> {
     return result;
   }
 
+  Iterable map(f(E element)) {
+    return new MappedIterable(this, f);
+  }
+
   List mappedBy(f(E element)) {
     return new MappedList(this, f);
   }