webui fixes for 0.8.9

lib/observe/observable.dart

Index: lib/observe/observable.dart
diff --git a/lib/observe/observable.dart b/lib/observe/observable.dart
index d763e19febe324f309ca4c9a70ebcae3f934944d..fbccf8f237be9ffb3ba79cc0b36cc6809c6dc0f4 100644
--- a/lib/observe/observable.dart
+++ b/lib/observe/observable.dart
@@ -18,7 +18,6 @@ import 'dart:async';
 import 'dart:collection' hide LinkedList;
 import 'list.dart';
 import 'map.dart';
-import 'reference.dart';
 import 'set.dart';
 import 'package:web_ui/src/utils_observe.dart' show hash3, hash4;
 import 'package:web_ui/src/linked_list.dart';
@@ -345,7 +344,7 @@ void notifyChange(Observable self, int type, key,
 
   if (_changedObjects == null) {
     _changedObjects = [];
-    runAsync(deliverChangesSync);
+    scheduleMicrotask(deliverChangesSync);
   }
   if (self.$_changes == null) {
     self.$_changes = [];