Set several MacOS file types to show platform warnings on download

Although we are sending FULL_PINGs for each of these file types,
it's probably useful to show platform warnings since the SB backend
will not be able to evaluate most of these.

Bug: 854877, 854855, 854838, 854808
Change-Id: Ib3f83626d0e4af281c8c9a89d1b7424110a597fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1526602
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641707}
3 files changed