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This CL updates close button strings in both incognito and guest menu
to align with the new menu design, as well as removing Other People
section in guest mode.

Design Deck: go/alignmenus

Screenshots:
https://screenshot.googleplex.com/6Vu7adRHK62CgxG.png

Bug: 1105763
Change-Id: Ib81fdcfe5816c08978c28b86ce22656b5e5f5d94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391069
Commit-Queue: Mariam Ali <alimariam@google.com>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804426}