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In the spirit of macOS Big Sur, which is labeled as macOS 11.0,
introduce OS_MAC and OS_APPLE. OS_MACOSX implicitly included OS_IOS,
which was confusing, so OS_APPLE is the new replacement for "macOS +
iOS" and OS_MAC is the new replacement for "just macOS, not iOS".

Bug: 1105907
Change-Id: I0f24ff5a74f07eaf2fe7b7fa17bdef7e82a514fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299189Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791353}