GitLab

Before this CL: In case of network errors,
PerUserTopicRegistrationRequest would most likely record an *HTTP*
response code of 0 in UMA histograms.

This CL fixes this by treating network errors before HTTP errors.

Bug: 1020145
Change-Id: Id54cad7a5e01a65fdd5c3cd5877679789af54a9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893157Reviewed-by: Tatiana Gornak <melandory@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712066}