package:observe fix various api issues

pkg/mdv/test/mdv_test_utils.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.
 
 library observe_utils;
 
 import 'dart:html';
 import 'package:observe/observe.dart';
 import 'package:unittest/unittest.dart';
 
 import 'package:observe/src/microtask.dart';
 export 'package:observe/src/microtask.dart';
 
 final bool parserHasNativeTemplate = () {
   var div = new DivElement()..innerHtml = '<table><template>';
   return div.firstChild.firstChild != null &&
       div.firstChild.firstChild.tagName == 'TEMPLATE';
 }();
 
-toSymbolMap(Map map) {
-  var result = new ObservableMap.linked();
-  map.forEach((key, value) {
-    if (value is Map) value = toSymbolMap(value);
-    result[new Symbol(key)] = value;
-  });
-  return result;
-}
-
 recursivelySetTemplateModel(element, model, [delegate]) {
   for (var node in element.queryAll('*')) {
     if (node.isTemplate) {
       node.bindingDelegate = delegate;
       node.model = model;
     }
   }
 }
 
 dispatchEvent(type, target) {
   target.dispatchEvent(new Event(type, cancelable: false));
 }
 
-class FooBarModel extends ObservableBase {
+class FooBarModel extends Observable {
   @observable var foo;
   @observable var bar;
 
   FooBarModel([this.foo, this.bar]);
 }
 
 @reflectable
-class FooBarNotifyModel extends ChangeNotifierBase implements FooBarModel {
+class FooBarNotifyModel extends ChangeNotifier implements FooBarModel {
   var _foo;
   var _bar;
 
   FooBarNotifyModel([this._foo, this._bar]);
 
   get foo => _foo;
   set foo(value) {
     _foo = notifyPropertyChange(#foo, _foo, value);
   }
 
   get bar => _bar;
   set bar(value) {
     _bar = notifyPropertyChange(#bar, _bar, value);
   }
 }
 
 observeTest(name, testCase) => test(name, wrapMicrotask(testCase));
 
 solo_observeTest(name, testCase) => solo_test(name, wrapMicrotask(testCase));