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Previously this class was used for SadTab presentation.

Bug: 616244
Change-Id: I8f8fcf722e79a723dd279c0be5f4348e3876069e
Reviewed-on: https://chromium-review.googlesource.com/c/1467983Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632360}