Handle authentication failures in the v2 app by restarting the app

remoting/webapp/crd/js/oauth2.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
  * OAuth2 class that handles retrieval/storage of an OAuth2 token.
  *
  * Uses a content script to trampoline the OAuth redirect page back into the
  * extension context.  This works around the lack of native support for
@@ skipping 64 matching lines @@
 
 /** @return {boolean} True if the app is already authenticated. */
 remoting.OAuth2.prototype.isAuthenticated = function() {
   if (this.getRefreshToken()) {
     return true;
   }
   return false;
 };
 
 /**
- * Removes all storage, and effectively unauthenticates the user.
+ * Remove the cached auth token, if any.
  *
+ * @param {function():void=} opt_onDone Completion callback.
  * @return {void} Nothing.
  */
-remoting.OAuth2.prototype.clear = function() {
+remoting.OAuth2.prototype.removeCachedAuthToken = function(opt_onDone) {
   window.localStorage.removeItem(this.KEY_EMAIL_);
   window.localStorage.removeItem(this.KEY_FULLNAME_);
   this.clearAccessToken_();
   this.clearRefreshToken_();
+  if (opt_onDone) {
+   opt_onDone();
+  }
 };
 
 /**
  * Sets the refresh token.
  *
  * @param {string} token The new refresh token.
  * @return {void} Nothing.
  * @private
  */
 remoting.OAuth2.prototype.setRefreshToken_ = function(token) {
@@ skipping 353 matching lines @@
  * @return {?string} The user's full name, if it has been cached by a previous
  * call to getUserInfo, otherwise null.
  */
 remoting.OAuth2.prototype.getCachedUserFullName = function() {
   var value = window.localStorage.getItem(this.KEY_FULLNAME_);
   if (typeof value == 'string') {
     return value;
   }
   return null;
 };