Bug 1772941 - Fix 'OS is not defined' lint

Differential Revision: https://phabricator.services.mozilla.com/D151439

dom/system/tests/worker_constants.js

@@ -1,6 +1,7 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/ */
 /* eslint-env mozilla/chrome-worker */
+/* global OS */
 
 function log(text) {
   dump("WORKER " + text + "\n");

toolkit/components/osfile/tests/mochi/worker_test_osfile_comms.js

@@ -17,6 +17,7 @@ self.onmessage = function(msg) {
   self.onmessage = function on_unexpected_message(msg) {
     throw new Error("Unexpected message " + JSON.stringify(msg.data));
   };
+  /* import-globals-from /toolkit/components/osfile/osfile.jsm */
   importScripts("resource://gre/modules/osfile.jsm");
   info("Initialization complete");