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The reason why the focus ring on gear icon is not square is because the
default setting of the button tag. Now we change edit-bg-gear to be a
div and add a role=button to make sure the a11y behaviour.

Screenshot:
https://screenshot.googleplex.com/TJpu8fFFpLW.png

Bug: 867777
Change-Id: Ifb8938b1fed139b3ba821976388bf154a58e8d85
Reviewed-on: https://chromium-review.googlesource.com/1176600Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583764}