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chromeos::TabletState's functionality will be embedded into
display::ScreenBase in the future. But for now, remove direct
references to it from //ui/ozone/platform/wayland.

This CL also works as a precursor CL to crrev.com/c/2491517
(see relation chain), given that chromeos::TabletState instances
will need to have PlatformScreen instance already set up.

BUG=1113900
R=jamescook@chromium.org, rjkroege@chromium.org

Change-Id: I2c89775deabae2a4a16aa45a35c707739b463a16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505608
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Maksim Sisov (GMT+2) <msisov@igalia.com>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#822135}