Bug 1900357 - Import UpdateListener.sys.mjs only for AppConstants.MOZ_UPDATER. r=aleca

!AppConstants.MOZ_UPDATER won't have that file...

Differential Revision: https://phabricator.services.mozilla.com/D212670

--HG--
extra : amend_source : 0444854ce44186ae027bb8700c2ed09d6b8f2aa8
extra : histedit_source : 5213a00b4567b701e36221ae87cd2a9d0527cece

mail/components/preferences/general.js

@@ -21,9 +21,11 @@ var { XPCOMUtils } = ChromeUtils.importESModule(
 var { AppConstants } = ChromeUtils.importESModule(
   "resource://gre/modules/AppConstants.sys.mjs"
 );
-var { UpdateListener } = ChromeUtils.importESModule(
-  "resource://gre/modules/UpdateListener.sys.mjs"
-);
+if (AppConstants.MOZ_UPDATER) {
+  ChromeUtils.defineESModuleGetters(this, {
+    UpdateListener: "resource://gre/modules/UpdateListener.sys.mjs",
+  });
+}
 var { UpdateUtils } = ChromeUtils.importESModule(
   "resource://gre/modules/UpdateUtils.sys.mjs"
 );