Noissue - set default values for platform interfaces to nullptr

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 109 matching lines @@
      * 
      */
     class JsWeakValuesID
     {
       friend class JsEngine;
       JsWeakValuesLists::const_iterator iterator;
     };
 
     /**
      * Creates a new JavaScript engine instance.
+     *
+     * When a parameter value is nullptr the corresponding default
+     * implementation is chosen.
+     *
      * @param appInfo Information about the app.
      * @param timer Implementation of timer.
      * @param fileSystem Implementation of filesystem.
      * @param webRequest Implementation of web request.
      * @param logSystem Implementation of log system.
      * @return New `JsEngine` instance.
      */
     static JsEnginePtr New(const AppInfo& appInfo = AppInfo(),
-      TimerPtr timer = CreateDefaultTimer(),
-      FileSystemPtr fileSystem = CreateDefaultFileSystem(),
-      WebRequestPtr webRequest = CreateDefaultWebRequest(),
-      LogSystemPtr logSystem = CreateDefaultLogSystem());
+      TimerPtr timer = nullptr, FileSystemPtr fileSystem = nullptr,
+      WebRequestPtr webRequest = nullptr, LogSystemPtr logSystem = nullptr);
 
     /**
      * Registers the callback function for an event.
      * @param eventName Event name. Note that this can be any string - it's a
      *        general purpose event handling mechanism.
      * @param callback Event callback function.
      */
     void SetEventCallback(const std::string& eventName, const EventCallback& callback);
 
     /**
@@ skipping 165 matching lines @@
     EventMap eventCallbacks;
     std::mutex eventCallbacksMutex;
     JsWeakValuesLists jsWeakValuesLists;
     std::mutex jsWeakValuesListsMutex;
     TimerPtr timer;
     WebRequestPtr webRequest;
   };
 }
 
 #endif