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This reverts commit 99a42e2d.

Reason for revert: Potential culprit for crbug.com/1152712, reverting to check the bot.

Original change's description:
> [iOS][Thumb Strip] Keep BVC's position fixed when switching to Incognito
>
> Before, when switching to incognito using the Thumb Strip, the BVC ended
> up having a frame.y = 36 (or some other non-zero constant). It looks
> like the BVC is currently positioned by frame, and my guess is that
> somehow, the position of some other element + constraints caused the
> BVC's frame to change after it was set. However, the BVC's frame could
> be set by constraint, as it should always be that value.
>
> Bug: 1094335
> Change-Id: Iedeedadf7ac7c7e842ebe4af02d8e62ed3b6a7c8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549947
> Commit-Queue: Robbie Gibson <rkgibson@google.com>
> Reviewed-by: Mark Cogan <marq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#830146}

TBR=marq@chromium.org,rkgibson@google.com

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

Bug: 1094335
Change-Id: I6fd0c59f79f9ac8bbc3cad70476ca3327b0c02e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560116Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830968}