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This reverts commit 33253a15.

Reason for revert: Broke PWA content fullscreen
https://crbug.com/1109608

Original change's description:
> Mac: modernize menu reveal tracking
> 
> The fullscreen toolbar controller currently uses undocumented Carbon
> events to track the menubar's reveal amount in fullscreen. In recent
> macOS versions, the intermediate values are no longer send and we
> only receive events when the menubar is fully shown or fully hidden.
> 
> The Mac immersive code which is still behind a flag uses a different
> technique, observing the reveal amount on a hidden titlebar accessory
> view. This *does* provide correct intermediate values.
> 
> This change extracts the reveal code from the immersive controller
> and uses it in the current fullscreen code rather than the Carbon
> event. Unfortunately, despite receiving the correct progress
> notifications, the topchrome still does a discontinuous jump, but
> we'll cross that bridge later.
> 
> Bug: 1063417
> Change-Id: I6827cafbcad58eeaabf98c6facaeb85ce3439997
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314998
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Commit-Queue: Leonard Grey <lgrey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#791273}

TBR=avi@chromium.org,lgrey@chromium.org

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

Bug: 1063417
Change-Id: Ie70a1ce26feddaa6aec2e0f061b8dd7656fcf55e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320409Reviewed-by: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791889}