lorenz: Switch to using gn_helpers

Hopefully this coupled with a build cache clean will be able to resolve
the issue on the lorenz bot.

Bug: 348423879
Change-Id: I840ab9c638c0cd1056528ab0ab2a26835f83371a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5698025
Auto-Submit: Peter Wen <wnwen@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1326380}
NOKEYCHECK=True
GitOrigin-RevId: 29b80e84a08adb3ea61c01ab15d7e616997cef5e
1 file changed