Bug 1635888 - Fix test failure in comm/calendar/test/unit/test_utils.js. rs=bustage-fix

--HG--
extra : rebase_source : b2f428f472d6e73316fc24b75faf5b0c69e92024
extra : histedit_source : 49425921d222c4d399d60753b8a309fee86493ca

calendar/test/unit/test_utils.js

@@ -103,8 +103,8 @@ function test_getStartEndProps() {
   equal(cal.dtz.startDateProp(cal.createTodo()), "entryDate");
   equal(cal.dtz.endDateProp(cal.createTodo()), "dueDate");
 
-  throws(() => cal.dtz.startDateProp(null), /2147500033/);
-  throws(() => cal.dtz.endDateProp(null), /2147500033/);
+  throws(() => cal.dtz.startDateProp(null), /NS_ERROR_NOT_IMPLEMENTED/);
+  throws(() => cal.dtz.endDateProp(null), /NS_ERROR_NOT_IMPLEMENTED/);
 }
 
 function test_OperationGroup() {