Updating Polymer to derive from custom elements.

pkg/polymer/test/event_path_test.html

Index: pkg/polymer/test/event_path_test.html
diff --git a/pkg/polymer/test/event_path_test.html b/pkg/polymer/test/event_path_test.html
index 3eb3e06c96d782fb5abf7c676d2b10eb5daac389..f8fa059e4cbc394ce98fd11fa41b437d58a9b782 100644
--- a/pkg/polymer/test/event_path_test.html
+++ b/pkg/polymer/test/event_path_test.html
@@ -28,7 +28,9 @@
     <script type="application/dart">
       import 'package:polymer/polymer.dart';
       @CustomTag("x-selector")
-      class XSelector extends PolymerElement {}
+      class XSelector extends PolymerElement {
+        XSelector.created() : super.created();
+      }
     </script>
   </polymer-element>
 
@@ -39,7 +41,9 @@
     <script type="application/dart">
       import 'package:polymer/polymer.dart';
       @CustomTag("x-overlay")
-      class XOverlay extends PolymerElement {}
+      class XOverlay extends PolymerElement {
+        XOverlay.created() : super.created();
+      }
     </script>
   </polymer-element>
 
@@ -52,7 +56,9 @@
     <script type="application/dart">
       import 'package:polymer/polymer.dart';
       @CustomTag("x-menu")
-      class XMenu extends PolymerElement {}
+      class XMenu extends PolymerElement {
+        XMenu.created() : super.created();
+      }
     </script>
   </polymer-element>
 
@@ -71,7 +77,9 @@
     <script type="application/dart">
       import 'package:polymer/polymer.dart';
       @CustomTag("x-menu-button")
-      class XMenuButton extends PolymerElement {}
+      class XMenuButton extends PolymerElement {
+        XMenuButton.created() : super.created();
+      }
     </script>
   </polymer-element>