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This reverts commit fa06bf45.

Reason for revert: Believe this introduces flakiness and failures on lacros. See https://bugs.chromium.org/p/chromium/issues/detail?id=1129425

Original change's description:
> ozone/wayland: gracefully shutdown the browser on protocol error.
> 
> Wayland may disconnect the client if it hits an unrecoverable
> error. That is, it prints an error message and client cannot
> do anything about that after that except shutting itself down.
> 
> Thus, while watching the display fd, always check for errors. If
> a protocol error is set, trigger |shutdown_cb| and also stop
> watching the fd.
> 
> Bug: 1127278
> Change-Id: Ie324af93d455c0c83f8e75cdecfafe2254da1972
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404931
> Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
> Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#807775}

TBR=rjkroege@chromium.org,msisov@igalia.com

Change-Id: Ie1cfa657b34930ebc6e568c1d422dbfae910197a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1127278
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416884Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808009}