GitLab

Remove already existing duplicate tests, and upstream a unified version
of currently existing an + b selector parsing tests.

Bug: 818475
Change-Id: Id889175e0d4df27037ee335d23020c213c148b44
Reviewed-on: https://chromium-review.googlesource.com/952078Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Chris Nardi <cnardi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541774}