These are already enabled by default on Chrome, but disabled on
platforms without site isolation. Moving to staging to get some
fuzzer coverage.

Bug: v8:10065
Change-Id: I11309926109441083ca39406dfbcc9108e6dd6fc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1972406Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65646}