Issue 5569 - add the possibility to use synchronous WebRequest and base path in File System

src/DefaultWebRequest.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 10 matching lines @@
 #include <AdblockPlus/IWebRequest.h>
 #include <AdblockPlus/Scheduler.h>
 
 namespace AdblockPlus
 {
   /**
    * `WebRequest` implementation that uses `WinInet` on Windows and libcurl
    * on other platforms. A dummy implementation that always reports failure is
    * used if libcurl is not available.
    */
-  class DefaultWebRequestSync
+  class DefaultWebRequestSync : public IWebRequestSync
   {
   public:
-    ServerResponse GET(const std::string& url, const HeaderList& requestHeaders) const;
+    ServerResponse GET(const std::string& url, const HeaderList& requestHeaders) const override;
   };
 
   class DefaultWebRequest : public IWebRequest
   {
   public:
-    explicit DefaultWebRequest(const Scheduler& scheduler, std::unique_ptr<DefaultWebRequestSync>&& syncImpl);
+    explicit DefaultWebRequest(const Scheduler& scheduler, WebRequestSyncPtr syncImpl);
     ~DefaultWebRequest();
 
     void GET(const std::string& url, const HeaderList& requestHeaders, const GetCallback& getCallback) override;
   private:
     Scheduler scheduler;
-    std::unique_ptr<DefaultWebRequestSync> syncImpl;
+    WebRequestSyncPtr syncImpl;
   };
 }
 
 #endif