Bug 1576038 - Increase the running timeout for browser_blockingCookies.js

Differential Revision: https://phabricator.services.mozilla.com/D43303

--HG--
extra : moz-landing-system : lando

toolkit/components/antitracking/test/browser/browser_blockingCookies.js

@@ -1,5 +1,7 @@
 /* import-globals-from antitracking_head.js */
 
+requestLongerTimeout(2);
+
 AntiTracking.runTestInNormalAndPrivateMode(
   "Set/Get Cookies",
   // Blocking callback