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Removes remaining KioskNext code and references.

Bug: 977019
Change-Id: Ic1d554d9771996f87e85ee2d335cbf82da2ec19d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1750264
Auto-Submit: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686671}