Issue 4832 - remove API allowing changing of FileSystem after Initialization of JsEngine

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 257 matching lines @@
      */
     JsValueList ConvertArguments(const v8::FunctionCallbackInfo<v8::Value>& arguments);
 
     /**
      * Private functionality.
      * @return The asynchronous IFileSystem implementation.
      */
     FileSystemPtr GetAsyncFileSystem() const;
 
     /**
-     * Sets the synchronous `FileSystem` implementation used for all
-     * file I/O. Setting this is optional, the engine will use the
-     * implementation created by `CreateDefaultFileSystem()` by
-     * default, which might be sufficient.
-     * @param The `FileSystem` instance to use.
-     */
-    void SetFileSystem(const FileSystemSyncPtr& val);
-
-    /**
      * Private functionality.
      * @return The LogSystem implementation.
      */
     LogSystem& GetLogSystem();
 
     /**
      * Sets a global property that can be accessed by all the scripts.
      * @param name Name of the property to set.
      * @param value Value of the property to set.
      */
@@ skipping 29 matching lines @@
     EventMap eventCallbacks;
     std::mutex eventCallbacksMutex;
     JsWeakValuesLists jsWeakValuesLists;
     std::mutex jsWeakValuesListsMutex;
     TimerPtr timer;
     WebRequestPtr webRequest;
   };
 }
 
 #endif