Always initialize the EventHandler in the standalone.

runtime/bin/eventhandler_patch.dart

 // Copyright (c) 2012, 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.
 
 import 'dart:nativewrappers';
 
 patch class _EventHandler {
-  /* patch */ static void _start() {
-    if (_eventHandler == null) {
-      _eventHandler = new _EventHandlerImpl();
-      _eventHandler._start();
-    }
-  }
-
-  /* patch */ static _sendData(Object sender,
-                               ReceivePort receivePort,
-                               int data) {
-    if (_eventHandler != null) {
-      _eventHandler._sendData(sender, receivePort, data);
-    }
-  }
-
-  static _EventHandlerImpl _eventHandler;
+  /* patch */ static void _sendData(Object sender,
+                                    ReceivePort receivePort,
+                                    int data)
+      native "EventHandler_SendData";
 }
 
-
-class _EventHandlerImpl {
-  _EventHandlerImpl() { }
-  void _start() native "EventHandler_Start";
-  void _sendData(Object sender, ReceivePort receivePort, int data)
-      native "EventHandler_SendData";
-}