Remove the NPAPI plugin from the webapp.

remoting/webapp/remoting.js

 // Copyright (c) 2012 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 || {};
 
 /** @type {remoting.HostSession} */ remoting.hostSession = null;
@@ skipping 172 matching lines @@
  * @param {Element} container The element to add the plugin to.
  * @return {remoting.HostPlugin} The new plugin instance or null if it failed to
  *     load.
  */
 remoting.createNpapiPlugin = function(container) {
   var plugin = document.createElement('embed');
   plugin.type = remoting.settings.PLUGIN_MIMETYPE;
   // Hiding the plugin means it doesn't load, so make it size zero instead.
   plugin.width = 0;
   plugin.height = 0;
-  container.appendChild(plugin);
 
   // Verify if the plugin was loaded successfully.
-  if (!plugin.hasOwnProperty('REQUESTED_ACCESS_CODE')) {
-    container.removeChild(plugin);
-    return null;
+  if (plugin.hasOwnProperty('REQUESTED_ACCESS_CODE')) {

[Sergey Ulanov, 2014/05/24 01:50:34]

Plugins are not loaded until they are added to DOM, this will always be false.
I'm not sure why you need to change this function.

+    container.appendChild(plugin);
+    return /** @type {remoting.HostPlugin} */ (plugin);
   }
 
-  return /** @type {remoting.HostPlugin} */ (plugin);
+  return null;
 };
 
 /**
  * Returns true if the current platform is fully supported. It's only used when
  * we detect that host native messaging components are not installed. In that
  * case the result of this function determines if the webapp should show the
  * controls that allow to install and enable Me2Me host.
  *
  * @return {boolean}
  */
@@ skipping 317 matching lines @@
 /**
  * Generate a nonce, to be used as an xsrf protection token.
  *
  * @return {string} A URL-Safe Base64-encoded 128-bit random value. */
 remoting.generateXsrfToken = function() {
   var random = new Uint8Array(16);
   window.crypto.getRandomValues(random);
   var base64Token = window.btoa(String.fromCharCode.apply(null, random));
   return base64Token.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
 };