[Chromoting] Change Application.Delegate to proper subclass of Application.

remoting/webapp/app_remoting/js/ar_main.js

Index: remoting/webapp/app_remoting/js/ar_main.js
diff --git a/remoting/webapp/app_remoting/js/ar_main.js b/remoting/webapp/app_remoting/js/ar_main.js
index 269b5ff9c90752621d98f71fedf2c5ebb81882f2..2efe129e03ce323801c0e9814573cfe78edae02f 100644
--- a/remoting/webapp/app_remoting/js/ar_main.js
+++ b/remoting/webapp/app_remoting/js/ar_main.js
@@ -11,8 +11,7 @@ var remoting = remoting || {};
  * Entry point ('load' handler) for App Remoting webapp.
  */
 remoting.startAppRemoting = function() {
-  remoting.app = new remoting.Application(remoting.app_capabilities());
-  var app_remoting = new remoting.AppRemoting(remoting.app);
+  remoting.app = new remoting.AppRemoting(remoting.app_capabilities());
   remoting.app.start();
 };