Reapply "Remove @deprecated features."

samples/survey/web/elements/question/question_element.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 survey.web.question;
 
 import 'dart:html';
 
 import 'package:polymer/polymer.dart';
 import 'package:survey/models.dart';
@@ skipping 27 matching lines @@
                                             MANY_FROM_MANY_OPT];
   @observable int widgetSelectedIndex = 0;
   @observable List<String> optionInputs = toObservable(['']);
 
   @observable String get widgetSelection => widgetOptions[widgetSelectedIndex];
 
   @observable bool get usingTextWidget => widgetSelectedIndex == 0;
 
   QuestionElement() {
     new PathObserver(this, 'widgetSelectedIndex').changes.listen((_) {
-      notifyProperty(this, #widgetSelection);
+      this.notifyPropertyChange(#widgetSelection, null, null);
     });
   }
 
   edit() {
     editing = true;
     errorMessage = '';
     optionInputs.add('');
   }
 
   addEmptyInput(Event e, var detail, Element sender) {
@@ skipping 53 matching lines @@
 
   setSelectionAnswers(Event e, var detail, Element sender) {
     e.preventDefault();
     question.answers = detail;
   }
 
   setTextAnswer(Event e, var detail, var sender) {
     e.preventDefault();
     question.answers = [sender.value.trim()];
   }
-}
+}