Use iterator, moveNext(), current.

tests/standalone/io/http_server_early_client_close_test.dart

Index: tests/standalone/io/http_server_early_client_close_test.dart
diff --git a/tests/standalone/io/http_server_early_client_close_test.dart b/tests/standalone/io/http_server_early_client_close_test.dart
index d1d0d0b06c32348ad4a19e72d05f6fbf2403c96f..aca38bd9dfbb5600828ccdc64b1bfe801cca0e38 100644
--- a/tests/standalone/io/http_server_early_client_close_test.dart
+++ b/tests/standalone/io/http_server_early_client_close_test.dart
@@ -81,13 +81,13 @@ void testEarlyClose() {
   HttpServer server = new HttpServer();
   server.listen("127.0.0.1", 0);
   void runTest(Iterator it) {
-    if (it.hasNext) {
-      it.next().execute(server).then((_) => runTest(it));
+    if (it.moveNext()) {
+      it.current.execute(server).then((_) => runTest(it));
     } else {
       server.close();
     }
   }
-  runTest(tests.iterator());
+  runTest(tests.iterator);
 }
 
 void main() {