Updated remoting.xhr API to use promises. Removed access to the native

remoting/webapp/crd/js/mock_host_list_api.js

 // Copyright 2014 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
  * Mock implementation of remoting.HostList
  */
 
 'use strict';
@@ skipping 53 matching lines @@
       var host = that.hosts[i];
       if (host.hostId == hostId) {
         host.hostName = hostName;
         host.hostPublicKey = hostPublicKey;
         onDone();
         return;
       }
     }
     console.error('PUT request for unknown host: ' + hostId +
                   ' (' + hostName + ')');
-    onError(remoting.Error.UNEXPECTED);
+    onError(remoting.Error.unexpected());
   };
   remoting.mockIdentity.validateTokenAndCall(onTokenValid, onError, []);
 };
 
 /**
  * @param {string} hostId
  * @param {function():void} onDone
  * @param {function(!remoting.Error):void} onError
  */
 remoting.MockHostListApi.prototype.remove =
     function(hostId, onDone, onError) {
   /** @type {remoting.MockHostListApi} */
   var that = this;
   var onTokenValid = function() {
     for (var i = 0; i < that.hosts.length; ++i) {
       var host = that.hosts[i];
       if (host.hostId == hostId) {
         that.hosts.splice(i, 1);
         onDone();
         return;
       }
     }
     console.error('DELETE request for unknown host: ' + hostId);
-    onError(remoting.Error.UNEXPECTED);
+    onError(remoting.Error.unexpected());
   };
   remoting.mockIdentity.validateTokenAndCall(onTokenValid, onError, []);
 };
 
 /**
  * @param {boolean} active
  */
 remoting.MockHostListApi.setActive = function(active) {
   remoting.hostListApi = active ? new remoting.MockHostListApi()
                                 : new remoting.HostListApiImpl();
 };