GitLab

Disallow setting NEL headers and queueing NEL reports when the HTTP
response is fetched via a proxy. Disallow NEL reporting on 407
responses.

Bug: 930777
Change-Id: I803c3e087630cd5e6c244771550c97091e5d6e74
Reviewed-on: https://chromium-review.googlesource.com/c/1466195
Commit-Queue: Lily Chen <chlily@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632021}