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They are not needed and get autoremoved on the server side, which
impedes the reviews.

Change-Id: Ie5a56e2d57946eaf09718b601dc6ddc8e75036f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015025
Commit-Queue: vitaliii <vitaliii@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: vitaliii <vitaliii@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734424}