Practically remove boot.js, adds the initialization from the Dart side of

samples/third_party/todomvc/test/listorder_test.dart

Index: samples/third_party/todomvc/test/listorder_test.dart
diff --git a/samples/third_party/todomvc/test/listorder_test.dart b/samples/third_party/todomvc/test/listorder_test.dart
index b854681ee215d70ca9405b3e486db468c2101252..0d70dfadf4c516ad6189dd816cca576ce17434cf 100644
--- a/samples/third_party/todomvc/test/listorder_test.dart
+++ b/samples/third_party/todomvc/test/listorder_test.dart
@@ -15,7 +15,8 @@ import '../web/model.dart';
  * switches from back and forth between "Active" and "All". This will make some
  * nodes to be hidden and readded to the page.
  */
-main() {
+@initMethod
+_main() {
   useHtmlConfiguration();
 
   final root = query('todo-app').shadowRoot;