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This CL removes a reference to diceEnabled in shouldShowProfile_.
Additionally it removes dead code: on desktop this branch is only used
when signin is disallowed and the user is signed out.

The tests related to the signout button are converted to use the Dice
flow.

Bug: 891781
Change-Id: I227bdbce52c38c24920433d6b2c8d21a4c6f3bd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015247
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735370}