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Do not try to derive one weight of font from another.
Use the API to directly generate them.

PlatformFontMacTest.FontWeightAPIConsistency tested that
our understanding of shifting weights up and down was
correct. The code no longer shifts weights up and down
as that is unreliable and version-specific, so there is
no need to test weight shifting and it is removed.

This also fixes Big Sur issues.

Bug: 1101426
Change-Id: I2165c3550ad295b3ee7742f3289874ed2bb89c68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340262
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796044}