Issue 4864 - Start using ESLint for adblockpluschrome

lib/messaging.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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 38 matching lines @@
           sendResponse,
           reason =>
           {
             console.error(reason);
             sendResponse(undefined);
           }
         );
         async = true;
       }
       else if (typeof response != "undefined")
+      {
         sendResponse(response);
+      }
     }
 
     return async;
   },
 
   /**
    * Function to be called when a particular message is received.
    *
    * @callback Port~messageCallback
    * @param {object} message
@@ skipping 51 matching lines @@
 exports.getPort = function(window)
 {
   let port = new Port();
   window.addEventListener("unload", () =>
   {
     port.disconnect();
   });
   return port;
 };