Eliminated named constants for instances of remoting.Error.

remoting/webapp/crd/js/xhr.js

 // Copyright (c) 2011 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
  * Simple utilities for making XHRs more pleasant.
  */
 
 'use strict';
@@ skipping 190 matching lines @@
  * @param {function():void} onDone
  * @param {function(!remoting.Error):void} onError
  * @param {Array<remoting.Error.Tag>=} opt_ignoreErrors
  * @return {function(XMLHttpRequest):void}
  */
 remoting.xhr.defaultResponse = function(onDone, onError, opt_ignoreErrors) {
   /** @param {XMLHttpRequest} xhr */
   var result = function(xhr) {
     var error =
         remoting.Error.fromHttpStatus(/** @type {number} */ (xhr.status));
-    if (!error.isError()) {
+    if (error.isNone()) {
       onDone();
       return;
     }
 
-    if (opt_ignoreErrors && opt_ignoreErrors.indexOf(error.tag) !== -1) {
+    if (opt_ignoreErrors && error.hasTag.apply(error, opt_ignoreErrors)) {
       onDone();
       return;
     }
 
     onError(error);
   };
   return result;
 };