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base::SysInfo::OperatingSystemArchitecture() should return the
architecture of the underlying OS, not the architecture of the
Chromium binary. However, arch(3) under Rosetta will lie.

Therefore, on the Mac, rely on the documented API to determine
if Chromium is running under Rosetta and return correct values.

Fixed: 1155315
Change-Id: I94e851b8e64eeacf776d1fed0579e5e543539402
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613154
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841164}