Template out V8 and prepare for other JS engine implementations

src/WebRequestJsObject.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
@@ skipping 82 matching lines @@
     try
     {
       AdblockPlus::JsEngine::ScheduleWebRequest(arguments);
     } catch (const std::exception& e)
     {
       return AdblockPlus::Utils::ThrowExceptionInJS(arguments.GetIsolate(), e.what());
     }
   }
 }
 
-AdblockPlus::JsValue& AdblockPlus::WebRequestJsObject::Setup(
-    AdblockPlus::JsEngine& jsEngine, AdblockPlus::JsValue& obj)
+JsValue& WebRequestJsObject::Setup(
+    JsEngine& jsEngine, JsValue& obj)
 {
   obj.SetProperty("GET", jsEngine.NewCallback(::GETCallback));
   return obj;
 }