Revert "WebUI: FocusRowBehavior, focus on equivalent control only if up/down was pressed"

This reverts commit dc931ca8d9dbb64840a7b4a16de96a4a9716b875.

Reason for revert: this caused issues with iron-list focusing on rows in crbug/957940 and crbug/949931. Reverting with https://chromium-review.googlesource.com/c/chromium/src/+/1598845.

Original change's description:
> WebUI: FocusRowBehavior, focus on equivalent control only if up/down was pressed
> 
> Bug: 901771
> Change-Id: Iea4fa9e711024f7f78ac363ed652b350e953e17a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1544978
> Reviewed-by: Scott Chen <scottchen@chromium.org>
> Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#646951}

TBR=scottchen@chromium.org,aee@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 901771
Change-Id: I7de6a9e355434fd1c3a4a54a6d99c12fae5db5f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599684
Reviewed-by: Esmael El-Moslimany <aee@chromium.org>
Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657522}
2 files changed