Issue 6489 - fix initialization moment of the default scheduler of DefaultPlatformBuilder

include/AdblockPlus/AsyncExecutor.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 79 matching lines @@
      */
     void Dispatch(const std::function<void()>& call)
     {
       std::lock_guard<std::mutex> lock(asyncExecutorMutex);
       if (!executor)
         return;
       executor->Dispatch(call);
     }
 
     /**
-     * Destroyes internally held `AsyncExecutor`, any subsequent calls of

[hub, 2018/03/19 11:48:43]

nit: "Destroys"

[sergei, 2018/03/19 12:34:26]

Done.

+     * Destroys internally held `AsyncExecutor`, any subsequent calls of
      * `Dispatch` have no effect.
      */
     void Invalidate()
     {
       std::unique_ptr<AsyncExecutor> tmp;
       {
         std::lock_guard<std::mutex> lock(asyncExecutorMutex);
         tmp = move(executor);
       }
     }
   private:
     std::mutex asyncExecutorMutex;
     std::unique_ptr<AsyncExecutor> executor;
   };
-}
+}