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It's unnecessary after the system tray button UI is added. Also the
locale list in Settings is not customized for Demo Mode.

Bug: 877749
Change-Id: I17c0ab8cab457a5a47416797677ce3b17d9b4b1b
Reviewed-on: https://chromium-review.googlesource.com/c/1334333
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608620}