Issue 3588 - Worked around fetch() API not supporting chrome-extension:// URLs on Chrome <47

lib/polyfills/fetch.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 48 matching lines @@
   // While the Fetch API is natively supported since Chrome 42, before
   // Chrome 47 it failed to fetch files from within the extension bundle.
   // https://code.google.com/p/chromium/issues/detail?id=466876
   var builtinFetch = global.fetch;
   if (builtinFetch)
     global.fetch = function(url, init)
     {
       return builtinFetch(url, init).catch(function(reason)
       {
         if (new URL(url, document.URL).protocol == "chrome-extension:")
-          return fetch(url)
+          return fetch(url);
         throw reason;
       });
     };
   else
     global.fetch = fetch;
 })(this);