Revert of Remove NPAPI plugin from chromoting webapp.

remoting/webapp/plugin_settings.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.
 
 // Contains all the settings that may need massaging by the build script.
 // Keeping all that centralized here allows us to use symlinks for the other
 // files making for a faster compile/run cycle when only modifying HTML/JS.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /** @type {remoting.Settings} */
 remoting.settings = null;
 /** @constructor */
 remoting.Settings = function() {};
 
 // The settings on this file are automatically substituted by build-webapp.py.
 // Do not override them manually, except for running local tests.
 
+/** @type {string} MIME type for the host plugin.*/
+remoting.Settings.prototype.PLUGIN_MIMETYPE = 'HOST_PLUGIN_MIMETYPE';
 /** @type {string} API client ID.*/
 remoting.Settings.prototype.OAUTH2_CLIENT_ID = 'API_CLIENT_ID';
 /** @type {string} API client secret.*/
 remoting.Settings.prototype.OAUTH2_CLIENT_SECRET = 'API_CLIENT_SECRET';
 
 /** @type {string} Base URL for OAuth2 authentication. */
 remoting.Settings.prototype.OAUTH2_BASE_URL = 'OAUTH2_BASE_URL';
 /** @type {string} Base URL for the OAuth2 API. */
 remoting.Settings.prototype.OAUTH2_API_BASE_URL = 'OAUTH2_API_BASE_URL';
 /** @type {string} Base URL for the Remoting Directory REST API. */
@@ skipping 16 matching lines @@
 // Third party authentication settings.
 /** @type {string} The third party auth redirect URI. */
 remoting.Settings.prototype.THIRD_PARTY_AUTH_REDIRECT_URI =
     'THIRD_PARTY_AUTH_REDIRECT_URL';
 
 // Whether to use MediaSource API for video rendering.
 remoting.Settings.prototype.USE_MEDIA_SOURCE_RENDERING = false;
 
 // 'native', 'nacl' or 'pnacl'.
 remoting.Settings.prototype.CLIENT_PLUGIN_TYPE = 'CLIENT_PLUGIN_TYPE';