Issue 3705 - Don't rely on info.platform when checking for availability of the chrome.* API

lib/notificationHelper.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 19 matching lines @@
 displayMethods.critical = ["icon", "notification", "popup"];
 displayMethods.question = ["notification"];
 displayMethods.normal = ["notification"];
 displayMethods.information = ["icon", "popup"];
 
 // Chrome on Linux does not fully support chrome.notifications until version 35
 // https://code.google.com/p/chromium/issues/detail?id=291485
 let canUseChromeNotifications = (function()
 {
   let info = require("info");
-  if (info.platform == "chromium" && "notifications" in chrome)
+  if (typeof chrome == "object" && "notifications" in chrome)
   {
     if (navigator.platform.indexOf("Linux") == -1)
       return true;
     if (Services.vc.compare(info.applicationVersion, "35") >= 0)
       return true;
   }
   return false;
 })();
 
 function prepareNotificationIconAndPopup()
@@ skipping 224 matching lines @@
  * @param {string} notificationType
  * @return {boolean}
  */
 exports.shouldDisplay = function(method, notificationType)
 {
   let methods = displayMethods[notificationType] || defaultDisplayMethods;
   return methods.indexOf(method) > -1;
 };
 
 NotificationStorage.addShowListener(showNotification);