Disable two SecurityExploitKillDisabledBrowserTest tests on the android-bfcache-rel builder

The tests are failing only on the android-bfcache-rel builder.

Bug: 511921842
Change-Id: Iacd6d39e6dba1e40a1eec22ffff6b998744f2cf5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7832495
Commit-Queue: Keigo Oka <oka@chromium.org>
Reviewed-by: Masa Fujita <massan@google.com>
Owners-Override: Keigo Oka <oka@chromium.org>
Auto-Submit: Keigo Oka <oka@chromium.org>
Commit-Queue: Masa Fujita <massan@google.com>
Cr-Commit-Position: refs/heads/main@{#1628391}
NOKEYCHECK=True
GitOrigin-RevId: fe68948faff836078570db9d6d774d75b22c04c0