[GM2 Cleanup] layout_constants.cc

#chrome-refresh-2023-cleanup

Change-Id: Id08776dc1d252973a6ea9c7cc43d69c24b143921
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5604666


Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Auto-Submit: Dana Fried <dfried@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1312329}