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This reverts commit fc86bd6c.

Reason for revert: https://crbug.com/1108561

Original change's description:
> mac/arm: Update to Xcode 12 beta 3.
> 
> Bug: 1098899
> Change-Id: I9423e63db7f55fe4c18271a26ff60cee6b802bc2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314676
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Commit-Queue: Mark Mentovai <mark@chromium.org>
> Auto-Submit: Nico Weber <thakis@chromium.org>
> Reviewed-by: Mark Mentovai <mark@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#791026}

TBR=thakis@chromium.org,mark@chromium.org

Change-Id: Ie6cdf343a6ed9530f3318530d50831f6a3197cce
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1098899
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315480Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791090}