GitLab

No behavior change is expected, this CL only goal is to have one .gni
file in absl in order to maintain it more easily.

Bug: None
Change-Id: I2694a1689755395a855cca94c49152477e5017f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128077Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754970}