Issue 6511 - Use messaging to register popup notification clicks

lib/notificationHelper.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 108 matching lines @@
     case "link":
       browser.tabs.create({
         url: Utils.getDocLink(activeNotification.links[buttonIndex])
       });
       break;
     case "open-all":
       openNotificationLinks();
       break;
     case "configure":
       Prefs.notifications_showui = true;
-      showOptions(page =>
+      showOptions((page, port) =>

[kzar, 2018/03/23 16:41:52]

Due to rebase, from #6476.

       {
-        page.sendMessage({
+        port.postMessage({
           type: "app.respond",
           action: "focusSection",
           args: ["notifications"]
         });
       });
       break;
     case "question":
       NotificationStorage.triggerQuestionListeners(activeNotification.id,
                                                    buttonIndex == 0);
       NotificationStorage.markAsShown(activeNotification.id);
@@ skipping 160 matching lines @@
   if (activeNotification)
     activeNotification.onClicked();
 };
 
 ext.pages.onLoading.addListener(page =>
 {
   NotificationStorage.showNext(stringifyURL(page.url));
 });
 
 NotificationStorage.addShowListener(showNotification);