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Followup to https://crrev.com/c/2285339; the new constant
kOsMacBigSur should be considered valid.

Bug: 1101436
Change-Id: Ifa5872d186ffd9d4886d941485ef3538b090d200
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354459
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797902}