Cleanup for pkg/observe and pkg/polymer

pkg/observe/test/path_observer_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'package:observe/observe.dart';
 import 'package:unittest/unittest.dart';
 import 'observe_test_utils.dart';
 
 // This file contains code ported from:
@@ skipping 183 matching lines @@
 
     }).then(newMicrotask).then((_) {
       expect(fooValues, ['baz']);
       expect(batValues, []);
     });
   });
 
   test('Path Value With Indices', () {
     var model = toObservable([]);
     var path = new PathObserver(model, '0');
-    path.open(expectAsync1((x) {
+    path.open(expectAsync((x) {
       expect(path.value, 123);
       expect(x, 123);
     }));
     model.add(123);
   });
 
   group('ObservableList', () {
     test('isNotEmpty', () {
       var model = new ObservableList();
       var path = new PathObserver(model, 'isNotEmpty');
       expect(path.value, false);
 
-      path.open(expectAsync1((_) {
+      path.open(expectAsync((_) {
         expect(path.value, true);
       }));
       model.add(123);
     });
 
     test('isEmpty', () {
       var model = new ObservableList();
       var path = new PathObserver(model, 'isEmpty');
       expect(path.value, true);
 
-      path.open(expectAsync1((_) {
+      path.open(expectAsync((_) {
         expect(path.value, false);
       }));
       model.add(123);
     });
   });
 
   for (var createModel in [() => new TestModel(), () => new WatcherModel()]) {
     test('Path Observation - ${createModel().runtimeType}', () {
       var model = createModel()..a =
           (createModel()..b = (createModel()..c = 'hello, world'));
@@ skipping 186 matching lines @@
 
 class WatcherModel extends Observable {
   // TODO(jmesserly): dart2js does not let these be on the same line:
   // @observable var a, b, c;
   @observable var a;
   @observable var b;
   @observable var c;
 
   WatcherModel();
 }