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The cleanup code was removed in r819537. This CL removes the handling of
the --cleanup command line switch.

BUG=none
R=gab@chromium.org

Change-Id: Iba5e9cd057378ccf2712f12f37589d6b84b0f7d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502161
Commit-Queue: Gabriel Charette <gab@chromium.org>
Auto-Submit: Greg Thompson <grt@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821404}