Issue 5179 - Implement asynchronous executor with a controllable lifetime

include/AdblockPlus/Platform.h

 /*
  * 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 155 matching lines @@
      * Constructs default implementation of `LogSystem`.
      */
     void CreateDefaultLogSystem();
 
     /**
      * Constructs Platform with default implementations of platform interfaces
      * when a corresponding field is nullptr and with a default Scheduler.
      */
     std::unique_ptr<Platform> CreatePlatform();
   private:
-    std::shared_ptr<Scheduler> asyncExecutor;
     Scheduler defaultScheduler;
   };
 }
 
 #endif // ADBLOCK_PLUS_PLATFORM_H