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This reverts commit d1531b9a.

Reason for revert:
Findit (https://goo.gl/kROfz5) identified CL at revision 711796 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtL2QxNTMxYjlhYzVhNDlkMTlmOTQ5ZTlkOGY0MmRhZjM0NzBkMzEzMmEM

Sample Failed Build: https://ci.chromium.org/b/8897957936228871696

Sample Failed Step: browser_tests

Original change's description:
> CrOS Shelf: Start moving some hotseat logic into the hotseat widget
>
> The general idea here is to encapsulate more of the hotseat's behavior
> into its own class rather than have it all over the shelf layout
> manager. Eventually, I hope to get rid of the huge
> "CalculateHotseatState" method by setting the hotseat state to the
> appropriate values from the relevant places.
>
> Change-Id: I03bf50bc9f6fb68f7f22f1b6ec966f08f48220da
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893997
> Commit-Queue: Manu Cornet <manucornet@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#711796}

TBR=xiyuan@chromium.org,manucornet@chromium.org

Change-Id: I7dd2357dd075bee067c3bad1aa58db788ba1039e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893885Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712119}