Part 8: Fix TaskController testcase.

Depends on D145207

Differential Revision: https://phabricator.services.mozilla.com/D145208

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1767087
gecko-commit: 26dcb894306030a4897a1e15ae4285d04646c422
gecko-reviewers: smaug

scheduler/post-task-with-abort-signal-in-handler.any.js

@@ -13,8 +13,8 @@ promise_test(t => {
 promise_test(t => {
   const controller = new TaskController();
   const signal = controller.signal;
-  return promise_rejects_dom(t, 'AbortError', scheduler.postTask(async () => {
+  return scheduler.postTask(async () => {
     await new Promise(resolve => t.step_timeout(resolve, 0));
     controller.abort();
-  }, { signal }));
+  }, { signal });
 }, 'Posting a task with a signal and abort the signal when running the async callback');