Issue 4871 - Start using ESLint for adblockplusui

ext/background.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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 "use strict";
 
+(function()
 {
   if (typeof ext == "undefined")
     window.ext = {};
 
   window.addEventListener("load", () =>
   {
     parent.postMessage({
       type: "backgroundPageLoaded"
     }, "*");
   }, false);
@@ skipping 61 matching lines @@
       addListener(listener)
       {
         window.addEventListener("message", (event) =>
         {
           if (event.data.type == "devtools")
             listener(new ext.Page(event.source));
         });
       }
     }
   };
-}
+}());