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Now that we're building against the macOS 11 SDK, do
some cleanup.

Bug: 1105187
Change-Id: I53fe103d8006f03dacdf2a9a2241bf743f39755f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545232
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828443}