Fix issue with bad cherry-pick.

Author: rwjblue

packages/ember-application/lib/system/application-instance.js

@@ -198,7 +198,7 @@ export default EmberObject.extend({
     @private
   */
   setupEventDispatcher() {
-    var dispatcher = this.lookup('event_dispatcher:main');
+    var dispatcher = this.container.lookup('event_dispatcher:main');
     var applicationCustomEvents = get(this.application, 'customEvents');
 
     dispatcher.setup(applicationCustomEvents, this.rootElement);