Bug 1782148 - Fix up imports of XPCOMUtils in ToastNotification code …

…r=nalexander

This also removes the import of Services.jsm since it is no longer required as
of bug 1667455.

Differential Revision: https://phabricator.services.mozilla.com/D153130

toolkit/components/backgroundtasks/BackgroundTask_message.jsm

@@ -65,9 +65,8 @@ const { ASRouter } = ChromeUtils.import(
 const { BackgroundTasksUtils } = ChromeUtils.import(
   "resource://gre/modules/BackgroundTasksUtils.jsm"
 );
-const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-const { XPCOMUtils } = ChromeUtils.import(
-  "resource://gre/modules/XPCOMUtils.jsm"
+const { XPCOMUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/XPCOMUtils.sys.mjs"
 );
 
 const lazy = {};