[safari] Issue 4902 - Partially revert d5be57b68f91 for Safari compatibility

lib/whitelisting.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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 /** @module whitelisting */
 
 "use strict";
 
 let {defaultMatcher} = require("matcher");
 let {RegExpFilter} = require("filterClasses");
 let {DownloadableSubscription} = require("subscriptionClasses");
 let {FilterNotifier} = require("filterNotifier");
 let {stringifyURL, getDecodedHostname, extractHostFromFrame, isThirdParty} = require("url");
 let {port} = require("messaging");
 let devtools = require("devtools");
-let {verifySignature} = require("rsa");
 
 let sitekeys = new ext.PageMap();
 
 function match(page, url, typeMask, docDomain, sitekey)
 {
   let thirdParty = !!docDomain && isThirdParty(url, docDomain);
   let urlString = stringifyURL(url);
 
   if (!docDomain)
     docDomain = getDecodedHostname(url);
@@ skipping 155 matching lines @@
 
 if (typeof chrome == "object")
   chrome.webRequest.onHeadersReceived.addListener(
     onHeadersReceived,
     {
       urls: ["http://*/*", "https://*/*"],
       types: ["main_frame", "sub_frame"]
     },
     ["responseHeaders"]
   );