[AppRemoting] Break out AppRemoting shared module (re-land).

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
deleted file mode 100644
index 2efe129e03ce323801c0e9814573cfe78edae02f..0000000000000000000000000000000000000000
--- a/remoting/webapp/app_remoting/js/ar_main.js
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-'use strict';
-
-/** @suppress {duplicate} */
-var remoting = remoting || {};
-
-/**
- * Entry point ('load' handler) for App Remoting webapp.
- */
-remoting.startAppRemoting = function() {
-  remoting.app = new remoting.AppRemoting(remoting.app_capabilities());
-  remoting.app.start();
-};
-
-window.addEventListener('load', remoting.startAppRemoting, false);