Don't deregister the host if it wasn't stopped.

remoting/webapp/host_controller.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 || {};
 
 /** @constructor */
@@ skipping 224 matching lines @@
  * @param {function(remoting.HostController.AsyncResult):void} callback
  *     Callback to be called when finished.
  * @return {void} Nothing.
  */
 remoting.HostController.prototype.stop = function(callback) {
   /** @type {remoting.HostController} */
   var that = this;
 
   /** @param {remoting.HostController.AsyncResult} result */
   function onStopped(result) {
-    if (that.localHost && that.localHost.hostId) {
+    if (result == remoting.HostController.AsyncResult.OK &&
+        that.localHost && that.localHost.hostId) {
       remoting.HostList.unregisterHostById(that.localHost.hostId);
     }
     callback(result);
   };
   this.plugin_.stopDaemon(onStopped);
 };
 
 /**
  * Parse a stringified host configuration and return it as a dictionary if it
  * is well-formed and contains both host_id and xmpp_login keys.  null is
@@ skipping 106 matching lines @@
   try {
     this.plugin_.getDaemonConfig(onConfig);
   } catch (err) {
     this.setHost(null);
     onDone();
   }
 };
 
 /** @type {remoting.HostController} */
 remoting.hostController = null;