GitLab

It's already enabled for HTTP proxies, and for most consumers of the NQE
output, there's not really much difference between the two, though
SOCKS proxies are lower overhead, particularly since they can't sit on
top of HTTPS or H2.

Bug: none
Change-Id: I901066a5a641c82dd386e79da65dd479513ab6c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509371Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638764}