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There will be different binaries offered for Intel and Arm Macs,
so distinguish them.

This achieves this via a slight refactor, funneling all the places
that show this data through the same function.

Bug: 1106067
Change-Id: Id5f44ab4d7ca3186d09669984abed5b0377224ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2305749
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791500}