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We added this back when nacl couldn't be built on macOS 10.15.
Now that that works, we no longer use machine_os_build_major, so remove it.

Bug: 1049832,1147069
Change-Id: I5c52631cc3500e9cd0057d32ccba1b8da97bd8b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536783
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827825}