Remove use_per_builder_build_dir_name from starlark libs

The experiment has no effect after https://crrev.com/c/7123611. So
should be safe to remove it from starlark libs.

chromium/src was regen'ed with this patch in
https://crrev.com/c/7113444, and the diff looks expected.

Bug: 380434968
Change-Id: I67be909038e7ac8a5c6fd47549632067aaa4c94d
Reviewed-on: https://chromium-review.googlesource.com/c/infra/chromium/+/7113443
Reviewed-by: Garrett Beaty <[email protected]>
Commit-Queue: Ben Pastene <[email protected]>
1 file changed
tree: edc4cc79e36fb86db4f90cd13b5ba1dc7164c61e
  1. infra/
  2. starlark-libs/
  3. .style.yapf
  4. OWNERS
  5. PRESUBMIT.py