Intermittent pass in /workers/dedicated-worker-from-blob-url.window.html

```

  ▶ OK [expected TIMEOUT] /workers/dedicated-worker-from-blob-url.window.html

  ▶ Unexpected subtest result in /workers/dedicated-worker-from-blob-url.window.html:
  └ PASS [expected TIMEOUT] Creating a dedicated worker from a blob URL works immediately before revoking.
```