Issue 5378 - Stop using of jshydra in libadblockplus

lib/io.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 25 matching lines @@
         for (var i = 0; i < lines.length; i++)
           listener.process(lines[i]);
         listener.process(null);
         callback(null);
       }
     });
   },
 
   writeToFile: function(file, data, callback, timeLineID)
   {
-    var content = data.join(this.lineBreak) + this.lineBreak;
+    let content = Array.from(data).join(this.lineBreak) + this.lineBreak;

[sergei, 2017/07/06 13:37:01]

core/filterStorage.js calls writeToFile and passes a result of a generator
function as data parameter.

     _fileSystem.write(file.path, content, callback);
   },
 
   copyFile: function(fromFile, toFile, callback)
   {
     // Simply combine read and write operations
     var data = [];
     this.readFromFile(fromFile, {
       process: function(line)
       {
@@ skipping 20 matching lines @@
   },
 
   statFile: function(file, callback)
   {
     _fileSystem.stat(file.path, function(result)
     {
       callback(result.error, result);
     });
   }
 };