merge_pr_57372

Use t.step_timeout in fetch-frame-resource.https.html

Replace setTimeout with t.step_timeout in fetch-frame-resource.https.html
to follow WPT best practices for timer-based tests. This ensures better
integration with the test harness and proper timeout handling.

Bug: w3c/ServiceWorker#1194
Change-Id: I02c796593546fc39f1e44b6c4ac72ee7b2f752e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7509313
Commit-Queue: Yoshisato Yanagisawa yyanagisawa@chromium.org
Reviewed-by: Marijn Kruisselbrink mek@chromium.org
Cr-Commit-Position: refs/heads/main@{#1575654}