[FedCM] Dismiss the error dialog in fedcm-identity-assertion-nocors
This otherwise causes the test to timeout when using wptrunner.
Bug: 336561988
Change-Id: I345b74f955c25534ef3daf1488495dd022e3925b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5750865
Commit-Queue: Nicolás Peña npm@chromium.org
Auto-Submit: Christian Biesinger cbiesinger@chromium.org
Reviewed-by: Nicolás Peña npm@chromium.org
Cr-Commit-Position: refs/heads/main@{#1335624}