Fixed callWithToken error handling.

remoting/webapp/wcs_loader.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
  * A class that loads a WCS IQ client and constructs remoting.wcs as a
  * wrapper for it.
  */
@@ skipping 23 matching lines @@
  * Load WCS if necessary, then invoke the callback with an access token.
  *
  * @param {function(string?): void} onReady The callback function, called with
  *     an OAuth2 access token when WCS has been loaded, or with null on error.
  * @return {void} Nothing.
  */
 remoting.WcsLoader.load = function(onReady) {
   if (!remoting.wcsLoader) {
     remoting.wcsLoader = new remoting.WcsLoader();
   }
-  /** @param {string} token The OAuth2 access token. */
+  /** @param {string?} token The OAuth2 access token. */
   var start = function(token) {
-    remoting.wcsLoader.start_(token, onReady);
+    if (token) {
+      remoting.wcsLoader.start_(token, onReady);
+    } else {
+      console.error('WcsLoader: Authentication failed.');
+      onReady(null);
+    }
   };
   remoting.oauth2.callWithToken(start);
 };
 
 /**
  * The URL of the GTalk gadget.
  * @type {string}
  * @private
  */
 remoting.WcsLoader.prototype.TALK_GADGET_URL_ =
@@ skipping 66 matching lines @@
  *     an OAuth2 access token when WCS has been loaded, or with null on error.
  * @return {void} Nothing.
  * @private
  */
 remoting.WcsLoader.prototype.constructWcs_ = function(token, onReady) {
   remoting.wcs = new remoting.Wcs(
       remoting.wcsLoader.wcsIqClient,
       token,
       function() { onReady(token); });
 };