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The patch is made in preparation to switching lacros build from
target_os=linux to target_os=chromeos. This will prevent lacros from
changing behaviour after the switch.

Unlike other patches with similar changes, //build changes are done
manually following similar rules outlined in http://go/lacros-macros.

Bug: 1052397
Cq-Depend: chromium:2581632
Change-Id: Ieda2c12eafa2e3f1a75ca024ecda60362fb2515e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581183Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837967}