Issue 7094 - Encapsulate management of subscription filters

lib/synchronizer.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 309 matching lines @@
 
           let match = /^(\d+)(?:\s+(\S+))?$/.exec(request.responseText);
           if (match && match[1] == "301" &&    // Moved permanently
               match[2] && /^https?:\/\//i.test(match[2]))
           {
             redirectCallback(match[2]);
           }
           else if (match && match[1] == "410") // Gone
           {
             let data = "[Adblock]\n" +
-              subscription.filters.join("\n");
+              [...subscription.filterText()].join("\n");
             redirectCallback("data:text/plain," + encodeURIComponent(data));
           }
         }, false);
         request.send(null);
       }
     }
   }
 }
 
 /**
  * This object is responsible for downloading filter subscriptions whenever
  * necessary.
  * @type {Synchronizer}
  */
 let synchronizer = new Synchronizer();
 
 exports.Synchronizer = synchronizer;