[Aura] Apply NTP fix to app list webui.

chrome/browser/resources/aura/app_list/app_list.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 App list UI.
  * For now, most of its logic is borrowed from ntp4.
  */
 
 // Use an anonymous function to enable strict mode just for this file (which
@@ skipping 31 matching lines @@
 
   function enterRearrangeMode() {
     appsView.enterRearrangeMode();
   }
 
   function getAppsCallback(data) {
     appsView.getAppsCallback(data);
   }
 
   function getAppsPageIndex(page) {
-    appsView.getAppsPageIndex(page);
+    return appsView.getAppsPageIndex(page);
   }
 
   function getCardSlider() {
     return appsView.cardSlider;
   }
 
   function leaveRearrangeMode(e) {
     appsView.leaveRearrangeMode(e);
   }
 
@@ skipping 31 matching lines @@
 ntp4.appAdded = appList.appAdded;
 ntp4.appRemoved = appList.appRemoved;
 ntp4.enterRearrangeMode = appList.enterRearrangeMode;
 ntp4.getAppsPageIndex = appList.getAppsPageIndex;
 ntp4.getCardSlider = appList.getCardSlider;
 ntp4.leaveRearrangeMode = appList.leaveRearrangeMode;
 ntp4.saveAppPageName = appList.saveAppPageName;
 ntp4.setAppToBeHighlighted = appList.setAppToBeHighlighted;
 
 document.addEventListener('DOMContentLoaded', appList.load);