Updating Polymer to derive from custom elements.

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/generator/webui/clickcounter.dart

Index: editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/generator/webui/clickcounter.dart
diff --git a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/generator/webui/clickcounter.dart b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/generator/webui/clickcounter.dart
index d31eecead0367ea7d645ad62f4c72dc0b2b397f0..3b4efe5d79d4faa0b1dd7a40e22aacd79ed7650f 100644
--- a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/generator/webui/clickcounter.dart
+++ b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/generator/webui/clickcounter.dart
@@ -1,12 +1,15 @@
 import 'package:polymer/polymer.dart';
 
 /**
- * A Polymer click counter element. 
+ * A Polymer click counter element.
  */
 @CustomTag('click-counter')
 class ClickCounter extends PolymerElement {
   @published int count = 0;
 
+  ClickCounter.created() : super.created() {
+  }
+
   void increment() {
     count++;
   }