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This reverts commit c2e39ede.

Reason for revert: Breaks Mac builder (https://ci.chromium.org/p/chromium/builders/ci/Mac%20Builder/119092)

Original change's description:
> Do clean up in PlatformFontMac
> 
> 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}

TBR=ellyjones@chromium.org,avi@chromium.org

Change-Id: I7a7d792d80eadfab524fc7235c3b9a349a34c970
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1101426
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343490Reviewed-by: Dominique Fauteux-Chapleau <domfc@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796059}