Updating Polymer to derive from custom elements.

samples/third_party/todomvc/web/router_options.dart

Index: samples/third_party/todomvc/web/router_options.dart
diff --git a/samples/third_party/todomvc/web/router_options.dart b/samples/third_party/todomvc/web/router_options.dart
index 5513afbad3a74f259a8abb04a3f0186397275013..0daddd0196892fbb7ffa2a24fa8df81f4d2ef67e 100644
--- a/samples/third_party/todomvc/web/router_options.dart
+++ b/samples/third_party/todomvc/web/router_options.dart
@@ -18,11 +18,15 @@ import 'package:polymer/polymer.dart';
 @CustomTag('router-options')
 class RouterOptions extends PolymerElement {
 
+  factory RouterOptions() => new Element.tag('router-options');
+
+  RouterOptions.created() : super.created();
+
   bool get applyAuthorStyles => true;
   var _sub;
 
-  void inserted() {
-    super.inserted();
+  void enteredView() {
+    super.enteredView();
 
     var anchors = this.queryAll('a');
 
@@ -42,8 +46,8 @@ class RouterOptions extends PolymerElement {
     _sub = windowLocation.changes.listen(_updateHash);
   }
 
-  void removed() {
+  void leftView() {
     _sub.cancel();
-    super.removed();
+    super.leftView();
   }
 }