GitLab

These tests should not be flaky after CL:2161032.

Also fix WebviewProxyAuthLoginTest to not crash if it would be
re-enabled, but actually re-enabling it will happen in another CL
because its flakiness may have been due to other issues.

Bug: 830337, 949511, 1022034
Test: browser_tests
Change-Id: Idc66e8516f7c1c381f0c76a8e820500a0a04924e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2171097
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763538}