GitLab

Annotate many of the browser_tests disabled under the NetworkService.

Also remove a couple that either no longer exist, have been disabled
generally due to flakiness, or are now passing.

BUG=844950, 844951, 844952, 853251, 844928,
BUG=843205, 844949, 844925, 844939, 821021,
BUG=853798, 844973, 844927, 844926, 844950

Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I094a012fe2076c7badf86a094140c7d74db183be
Reviewed-on: https://chromium-review.googlesource.com/1104802
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568464}