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This reverts commit 61bed816.

Reason for revert: Broke [Build Non-Channel Targets] build step

Original change's description:
> Horizontal tab switcher use tab toggle
> 
> Replace the HTS Incognito Button with a toggle.
> 
> Bug: 851166
> Change-Id: I5c431abb508930ee1a9a24792f2299ea08d944cf
> Reviewed-on: https://chromium-review.googlesource.com/1246453
> Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
> Commit-Queue: Pedro Amaral <amaralp@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#594780}

TBR=yusufo@chromium.org,amaralp@chromium.org

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

Bug: 851166
Bug: 890673
Change-Id: I3631d88c29bd950beea9280e97e0ff50ed332bc8
Reviewed-on: https://chromium-review.googlesource.com/1253741Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595411}