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The "Manage profiles" button is added as a profile shortcut
feature button.

Screenshot:
https://drive.google.com/file/d/14OgB985dHUyEM18_peTN1dheH9fHnx7k/view?usp=sharing

Flag: profile-menu-revamp

Bug: 995720
Change-Id: I5860c248945bc3e567f8d917320d86055c36fd71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1811219
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697967}