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The row is sometimes clickable, depending on whether you are looking at
browser vs. OS settings, and whether ChromeOSAccountManager is enabled
or not.

When it is clickable, ensure the <div> elements are "actionable" so we
get the right cursor.

Also fix a problem where the avatar icon wasn't clickable in the
OS settings people section.

Screenshot from Chrome OS showing actionable row in OS settings:
https://screenshot.googleplex.com/ygC6Bn208dB

Screenshot from Linux (unchanged):
https://screenshot.googleplex.com/efW97d7diRY

Bug: 1002024
Test: added to browser_tests
Change-Id: Ib3a9f17e2d0f9b72eb6793e845c4679c141ccc1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797122Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695406}