Changing onCreated callback to created.

tools/dom/src/dart2js_CustomElementSupport.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.
 
 part of dart.dom.html;
 
-_callOnCreated(receiver) {
-  return receiver.onCreated();
+_callCreated(receiver) {
+  return receiver.created();
 }
 
 _makeCreatedCallbackMethod() {
   return JS('',
       '''((function(invokeCallback) {
              return function() {
                return invokeCallback(this);
              };
           })(#))''',
-      convertDartClosureToJS(_callOnCreated, 1));
+      convertDartClosureToJS(_callCreated, 1));
 }
 
 void _registerCustomElement(context, document, String tag, Type type) {
   // Function follows the same pattern as the following JavaScript code for
   // registering a custom element.
   //
   //    var proto = Object.create(HTMLElement.prototype, {
   //        createdCallback: {
   //          value: function() {
   //            window.console.log('here');
@@ skipping 27 matching lines @@
   var baseProto = JS('=Object', '#.prototype', baseConstructor);
   var proto = JS('=Object', 'Object.create(#, #)', baseProto, properties);
 
   var interceptor = JS('=Object', '#.prototype', interceptorClass);
 
   setNativeSubclassDispatchRecord(proto, interceptor);
 
   JS('void', '#.register(#, #)',
       document, tag, JS('', '{prototype: #}', proto));
 }