Bug 1777486 - Part 1: Migrate XPCOMUtils.jsm to XPCOMUtils.sys.mjs. r=kmag

Differential Revision: https://phabricator.services.mozilla.com/D151213

js/xpconnect/loader/XPCOMUtils.sys.mjs

@@ -4,8 +4,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-var EXPORTED_SYMBOLS = ["XPCOMUtils"];
-
 const { AppConstants } = ChromeUtils.import(
   "resource://gre/modules/AppConstants.jsm"
 );
@@ -35,7 +33,7 @@ function redefine(object, prop, value) {
   return value;
 }
 
-var XPCOMUtils = {
+export var XPCOMUtils = {
   /**
    * Defines a getter on a specified object that will be created upon first use.
    *

js/xpconnect/loader/moz.build

@@ -49,7 +49,7 @@ EXPORTS.mozilla.loader += [
 
 EXTRA_JS_MODULES += [
     "ComponentUtils.jsm",
-    "XPCOMUtils.jsm",
+    "XPCOMUtils.sys.mjs",
 ]
 
 FINAL_LIBRARY = "xul"