Use iterator, moveNext(), current.

utils/tests/pub/test_pub.dart

Index: utils/tests/pub/test_pub.dart
diff --git a/utils/tests/pub/test_pub.dart b/utils/tests/pub/test_pub.dart
index 36699b2e2e1bc613a822986fe4ee19f83186ea82..1dafa4d32e0b1248604ca0c81047924e993befab 100644
--- a/utils/tests/pub/test_pub.dart
+++ b/utils/tests/pub/test_pub.dart
@@ -605,16 +605,16 @@ Future<Directory> _setUpSandbox() {
 
 Future _runScheduled(Directory parentDir, List<_ScheduledEvent> scheduled) {
   if (scheduled == null) return new Future.immediate(null);
-  var iterator = scheduled.iterator();
+  var iterator = scheduled.iterator;
 
   Future runNextEvent(_) {
-    if (_abortScheduled || !iterator.hasNext) {
+    if (_abortScheduled || !iterator.moveNext()) {
       _abortScheduled = false;
       scheduled.clear();
       return new Future.immediate(null);
     }
 
-    var future = iterator.next()(parentDir);
+    var future = iterator.current(parentDir);
     if (future != null) {
       return future.chain(runNextEvent);
     } else {