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This reverts commit c1744bc0.

Reason for revert: Broke build: https://crbug.com/1132766

Original change's description:
> exo: Move XkbTracker from WaylandKeyboardDelegate to Seat.
>
> This is preparation to share XkbTracker with wayland IME server.
>
> BUG=1123705
> TEST=Built locally. Run exo_unittests.
>
> Change-Id: I7859c2193578cc5a18fa39a96c3fe86d2f39f4dc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2428505
> Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
> Reviewed-by: Jun Mukai <mukai@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#810863}

TBR=mukai@chromium.org,hidehiko@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1123705,1132766
Change-Id: I92c8df6383ea569ca2b88780c6017c619e26d1af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434097
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811383}