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This reverts commit 0e75ebad.

Reason for revert: The workaround did not stop the crashes.

Original change's description:
> Shutdown UDP sockets before close on Mac OS
>
> On Big Sur, guarded_close_np() has started sometimes returning
> EPROTOTYPE or ENOTCONN errors. Try calling shutdown() before close as
> a speculative workaround.
>
> BUG=1151048
>
> Change-Id: I99e4a58f1468027402099fd5b0220872f14b1578
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561079
> Reviewed-by: David Schinazi <dschinazi@chromium.org>
> Commit-Queue: Adam Rice <ricea@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#833429}

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1151048
Change-Id: Idea3fef1f32cc4c97a239e5e7e799ab5ed7eb520
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592572Reviewed-by: David Schinazi <dschinazi@chromium.org>
Commit-Queue: David Schinazi <dschinazi@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Auto-Submit: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837190}