GitLab

|preferred_height_| isn't no longer used. This CL is for cleaning up.

Bug: none
Change-Id: I8c82e540c90bed5101fb2fcb07c06c70824177b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2257088
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780784}