Create proper object types when loading host cache.

remoting/webapp/crd/js/host_list.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.
 
 /**
  * @fileoverview
  * Class representing the host-list portion of the home screen UI.
  */
 
 'use strict';
@@ skipping 91 matching lines @@
  * @param {function():void} onDone Completion callback.
  */
 remoting.HostList.prototype.load = function(onDone) {
   // Load the cache of the last host-list, if present.
   /** @type {remoting.HostList} */
   var that = this;
   /** @param {Object<string>} items */
   var storeHostList = function(items) {
     if (items[remoting.HostList.HOSTS_KEY]) {
       var cached = base.jsonParseSafe(items[remoting.HostList.HOSTS_KEY]);
-      if (cached) {
-        that.hosts_ = /** @type {Array<remoting.Host>} */ (cached);
+      if (cached && cached instanceof Array) {
+        that.hosts_ = cached
+            .map((host) => remoting.Host.fromObject(host))
+            .filter((host) => Boolean(host));
       } else {
         console.error('Invalid value for ' + remoting.HostList.HOSTS_KEY);
       }
     }
     onDone();
   };
   chrome.storage.local.get(remoting.HostList.HOSTS_KEY, storeHostList);
 };
 
 /**
@@ skipping 350 matching lines @@
   }
 };
 
 /**
  * Key name under which Me2Me hosts are cached.
  */
 remoting.HostList.HOSTS_KEY = 'me2me-cached-hosts';
 
 /** @type {remoting.HostList} */
 remoting.hostList = null;