The header sizes vary between boards, so it should be disabled for
ChromeOS. It seems the disabling got lost when updating GN flags for
lacros.

Bug: 1049569, 1203750
Change-Id: I2580f566e13ddbd2fc30116ebaa3b4b35b449df8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2854673


Auto-Submit: Hans Wennborg <hans@chromium.org>
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Min Chen <minch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#877252}
NOKEYCHECK=True
GitOrigin-RevId: db02623317ca628641c92bf16bab01d3a50adba6