Noissue - Cleanup. Remove last remnants of old thread code.

src/DefaultFileSystem.cpp

 /*
  * 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "DefaultFileSystem.h"
 #include <cstdio>
 #include <cstring>
 #include <fstream>
 #include <sstream>
 #include <stdexcept>
-#include <thread>
 
 #include <sys/types.h>
 
 #ifdef _WIN32
 #include <windows.h>
 #include <Shlobj.h>
 #include <Shlwapi.h>
 #else
 #include <sys/stat.h>
 #include <cerrno>
@@ skipping 275 matching lines @@
       error = "Unknown error while calling stat on " + fileName + " as " + Resolve(fileName);
     }
     callback(StatResult(), error);
   });
 }
 
 std::string DefaultFileSystem::Resolve(const std::string& fileName) const
 {
   return syncImpl->Resolve(fileName);
 }