GitLab

Both ui.ExistingUserLogin and ui.SigninProfileExtension
were recently promoted to critical tests, but failed since
they need to access some variables in tast-tests-private,
which are not available in Chromium CQ.

Bug: 1148036
Change-Id: I1c3e4e4a53555aa769a8e3e17a03288cf6b2b46a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533234Reviewed-by: Shuhei Takahashi <nya@chromium.org>
Commit-Queue: Jenny Zhang <jennyz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826615}