Issue 2528 - Don't parse CSS selectors that have no comma

include.preload.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 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 132 matching lines @@
 }
 
 function convertSelectorsForShadowDOM(selectors)
 {
   var result = [];
   var prefix = "::content ";
 
   for (var i = 0; i < selectors.length; i++)
   {
     var selector = selectors[i];
+    if (selector.indexOf(",") == -1)
+    {
+      result.push(prefix + selector);
+      continue;
+    }
+
     var start = 0;
     var sep = "";
-
     for (var j = 0; j < selector.length; j++)
     {
       var chr = selector[j];
       if (chr == "\\")
         j++;
       else if (chr == sep)
         sep = "";
       else if (sep == "")
       {
         if (chr == '"' || chr == "'")
@@ skipping 124 matching lines @@
   }, true);
 
   return updateStylesheet;
 }
 
 if (document instanceof HTMLDocument)
 {
   checkSitekey();
   window.updateStylesheet = init(document);
 }