Wire GrowableArray to use the internal VM object.

lib/literal_factory.dart

Index: lib/literal_factory.dart
===================================================================
--- lib/literal_factory.dart	(revision 6293)
+++ lib/literal_factory.dart	(working copy)
@@ -10,7 +10,7 @@
   factory List.fromLiteral(List elements) {
     var list = new GrowableObjectArray<E>();
     if (elements.length > 0) {
-      list.backingArray = elements;
+      list.data = elements;
       list.length = elements.length;
     }
     return list;