Issue 3860 - Move request blocking logic to a seperate module

include.preload.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 122 matching lines @@
   var mediatype = typeMap[element.localName];
   if (!mediatype)
     return;
 
   var urls = getURLsFromElement(element);
   if (urls.length == 0)
     return;
 
   ext.backgroundPage.sendMessage(
     {
-      type: "should-collapse",
+      type: "filters.collapse",
       urls: urls,
       mediatype: mediatype,
       baseURL: document.location.href
     },
 
     function(collapse)
     {
       function collapseElement()
       {
         if (element.localName == "frame")
@@ skipping 398 matching lines @@
   }, true);
 
   return updateStylesheet;
 }
 
 if (document instanceof HTMLDocument)
 {
   checkSitekey();
   window.updateStylesheet = init(document);
 }