GitLab

Setting tabIndex=-1 no longer allows child elements to be focusable in
Shadow DOM v1 (see bug for additional context).

Remove logic that does this, and in order to prevent focusing of the
parent element when traversing backwards from the first item in the
focus row, listen for shift+tab on this element.

Bug: 896624
Change-Id: I35e871863418e7bca57f648713b8d172677a949c
Reviewed-on: https://chromium-review.googlesource.com/c/1325352
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608546}