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By default, clicking on the People > Profile row will open the Chrome OS
account manager in a new window.

Change the row to use the "link out" arrow icon. Screenshot:
http://screen/UBHW5acnie0

If ChromeOSAccountManager is disabled, it does nothing on click, like
before.

If SplitSettings is disabled, it opens the profile picture picker, like
before.

Bug: 1004446
Test: added to browser_tests
Change-Id: Ia537bdc4fa841ec1995496b87c4650e0b1e761a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1811862Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697820}