Issue 4938 - fix race conditions and get rid of hacks related to DefaultFileSystem

include/AdblockPlus/JsEngine.h

 /*
  * 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 41 matching lines @@
   typedef std::shared_ptr<JsEngine> JsEnginePtr;
 
   /**
    * A factory to construct DefaultTimer.
    */
   TimerPtr CreateDefaultTimer();
 
   /**
    * A factory to construct DefaultFileSystem.
    */
-  FileSystemPtr CreateDefaultFileSystem();
+  FileSystemPtr CreateDefaultFileSystem(const Scheduler& scheduler);
 
   /**
    * A factory to construct DefaultWebRequest.
    */
   WebRequestPtr CreateDefaultWebRequest(const Scheduler& scheduler);
 
   /**
    * A factory to construct LogSystem.
    */
   LogSystemPtr CreateDefaultLogSystem();
@@ skipping 247 matching lines @@
     EventMap eventCallbacks;
     std::mutex eventCallbacksMutex;
     JsWeakValuesLists jsWeakValuesLists;
     std::mutex jsWeakValuesListsMutex;
     TimerPtr timer;
     WebRequestPtr webRequest;
   };
 }
 
 #endif