Using a private API to determine if there is an account for the profile

chrome/browser/resources/google_now/background.js

 // Copyright (c) 2013 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.
 
 'use strict';
 
 /**
  * @fileoverview The event page for Google Now for Chrome implementation.
  * The Google Now event page gets Google Now cards from the server and shows
  * them as Chrome notifications.
@@ skipping 217 matching lines @@
   chrome.metricsPrivate.recordValue(metricDescription, event);
 }
 
 /**
  * Adds authorization behavior to the request.
  * @param {XMLHttpRequest} request Server request.
  * @param {function(boolean)} callbackBoolean Completion callback with 'success'
  *     parameter.
  */
 function setAuthorization(request, callbackBoolean) {
-  authenticationManager.isSignedIn(function(token) {
+  authenticationManager.getAuthToken(function(token) {
     if (!token) {
       callbackBoolean(false);
       return;
     }
 
     request.setRequestHeader('Authorization', 'Bearer ' + token);
 
     // Instrument onloadend to remove stale auth tokens.
     var originalOnLoadEnd = request.onloadend;
     request.onloadend = wrapper.wrapCallback(function(event) {
@@ skipping 725 matching lines @@
   setBackgroundEnable(shouldSetBackground);
   setShouldPollCards(shouldPollCards);
 }
 
 /**
  * Coordinates the behavior of Google Now for Chrome depending on
  * Chrome and extension state.
  */
 function onStateChange() {
   tasks.add(STATE_CHANGED_TASK_NAME, function() {
-    authenticationManager.isSignedIn(function(token) {
-      var signedIn = !!token;
+    authenticationManager.isSignedIn(function(signedIn) {
       instrumented.metricsPrivate.getVariationParams(
           'GoogleNow',
           function(response) {
             var enableBackground =
                 (!response || (response.enableBackground != 'false'));
             instrumented.notifications.getPermissionLevel(function(level) {
               var notificationEnabled = (level == 'granted');
               instrumented.
                 preferencesPrivate.
                 googleGeolocationAccessEnabled.
@@ skipping 98 matching lines @@
 
           updateCardsAttempts.isRunning(function(running) {
             if (running)
               requestNotificationGroups([]);
           });
         }
       });
     });
   }
 });