GitLab

This makes the constructors of [Partial]NetworkAnnotationTag private,
so that the new traffic_annotation_extractor won't need to locate calls
to those constructors.

Bug: 966883
Change-Id: I41559a554777cb6b5520e2dd3a940f14d60e68aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626493
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664760}