Issue 5034 - Part 2: Have NewCallback() return a plain JsValue

src/WebRequestJsObject.cpp

 /*
  * 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 100 matching lines @@
       return v8::ThrowException(ToV8String(isolate, e.what()));
     }
     thread->Start();
     return v8::Undefined();
   }
 }
 
 AdblockPlus::JsValue& AdblockPlus::WebRequestJsObject::Setup(
     AdblockPlus::JsEngine& jsEngine, AdblockPlus::JsValue& obj)
 {
-  obj.SetProperty("GET", *jsEngine.NewCallback(::GETCallback));
+  obj.SetProperty("GET", jsEngine.NewCallback(::GETCallback));
   return obj;
 }