Issue 3823 - Split up message responder code

background.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 172 matching lines @@
       if (filter.collapse != null)
         return filter.collapse;
 
       blocked = true;
     }
   }
 
   return blocked && Prefs.hidePlaceholders;
 });
 
-port.on("get-domain-enabled-state", function(msg, sender)
-{
-  return {enabled: !checkWhitelisted(sender.page)};
-});
-
 port.on("forward", function(msg, sender)
 {
   var targetPage;
   if (msg.targetPageId)
     targetPage = ext.getPage(msg.targetPageId);
   else
     targetPage = sender.page;
 
   if (targetPage)
   {
     msg.payload.sender = sender.page.id;
     if (msg.expectsResponse)
       return new Promise(targetPage.sendMessage.bind(targetPage, msg.payload));
     targetPage.sendMessage(msg.payload);
   }
 });
 
 // update icon when page changes location
 ext.pages.onLoading.addListener(function(page)
 {
   page.sendMessage({type: "composer.content.finished"});
   refreshIconAndContextMenu(page);
   showNextNotificationForUrl(page.url);
 });