GitLab

`browser_tests --gtest_filter=DiagnosticsApp*` to run in a single instance.
`browser_tests --run-manual --gtest_filter=DiagnosticsApp.MANUAL_*`
to run each test on a new instance.

Bug: 1125150
Test: Described above.
Change-Id: Iebef0469550523c2ef588e6ff6816ee2cc54683e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508792
Commit-Queue: Joon Ahn <joonbug@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822919}