Unregister host if we fail to start it.

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 120 matching lines @@
       // information won't be in sync for several seconds. We don't know the
       // host JID or public key, but they can be missing from the cache with
       // no ill effects (it will be refreshed--we hope that the directory
       // will have been updated by that point).
       var localHost = new remoting.Host();
       localHost.hostName = hostName;
       localHost.hostId = newHostId;
       localHost.status = 'ONLINE';
       that.setHost(localHost);
       remoting.hostList.addHost(localHost);
+    } else {
+      // Unregister the host if we failed to start it.
+      remoting.HostList.unregisterHostById(newHostId);
     }
     callback(result);
   };
 
   /** @param {string} privateKey
    *  @param {XMLHttpRequest} xhr */
   function onRegistered(privateKey, xhr) {
     var success = (xhr.status == 200);
 
     if (success) {
@@ skipping 166 matching lines @@
     } else {
       that.setHost(null);
     }
     onDone();
   };
   this.plugin_.getDaemonConfig(onConfig);
 };
 
 /** @type {remoting.HostController} */
 remoting.hostController = null;