Add long timeout to window-indexed-properties-delete-no-cache.html
This test started timing out on some mac bots, so hopefully adding a
longer timeout addresses the issue.
Fixed: 353583079
Change-Id: Ifc0c9ad132efb55d3ed6adb2f506faf37883d23d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5724905
Reviewed-by: Di Zhang dizhangg@chromium.org
Commit-Queue: Joey Arhar jarhar@chromium.org
Cr-Commit-Position: refs/heads/main@{#1330453}