Issue 370 - Right-clicked element is removed independent of created filter

include.preload.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 94 matching lines @@
       return document.location.protocol + "//" + document.location.host + url;
   }
 
   // Remove filename and add relative URL to it
   var base = document.baseURI.match(/.+\//);
   if (!base)
     return document.baseURI + "/" + url;
   return base[0] + url;
 }
 
+var setElemhideCSSRules = null;
+
 function init(document)
 {
   var canUseShadow = "webkitCreateShadowRoot" in document.documentElement;
   var fixInlineFrames = false;
 
   var match = navigator.userAgent.match(/\bChrome\/(\d+)/);
   if (match)
   {
     var chromeVersion = parseInt(match[1]);
 
@@ skipping 14 matching lines @@
   // rely on the order of their own <style> tags (#309). However we
   // must not create the shadow root in the response callback passed
   // to sendMessage(), otherwise Chrome breaks some websites (#450).
   if (canUseShadow)
   {
     var shadow = document.documentElement.webkitCreateShadowRoot();
     shadow.appendChild(document.createElement("shadow"));
   }
 
   // Sets the currently used CSS rules for elemhide filters
-  var setElemhideCSSRules = function(selectors)
+  setElemhideCSSRules = function(selectors)
   {
     if (selectors.length == 0)
       return;
 
     var style = document.createElement("style");
     style.setAttribute("type", "text/css");
 
     if (canUseShadow)
     {
       shadow.appendChild(style);
@@ skipping 63 matching lines @@
   }, true);
 
   ext.backgroundPage.sendMessage({type: "get-selectors"}, setElemhideCSSRules);
 }
 
 if (document instanceof HTMLDocument)
 {
   checkExceptionKey();
   init(document);
 }