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This reverts commit 57098dce.

Reason for revert: Causing test failures: https://bugs.chromium.org/p/chromium/issues/detail?id=1062658

Original change's description:
> Better coordinate swipe to home gesture and drag handle nudge
> 
> Manages the drag handle nudge during window drag from shelf to home or
> overview (which may end up in a gesture the nudge is describing).
> 
> If the contextual nudge is shown when the window drag starts, the nudge
> will not be hidden until the gesture completes (end it will get hidden
> when the gesture completes, even if the user does not end up going
> home).
> 
> If the contextual nudge is scheduled to be shown when the gesture
> starts, the show request will be canceled.
> 
> Adds logic that prevents drag handle nudge from showing up, unless it's
> a result of an explicit user action - tapping the drag handle.
> 
> BUG=1058617
> 
> Change-Id: I96fa2748308143ec42295dbfb472dc564da5bd03
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107135
> Commit-Queue: Toni Baržić <tbarzic@chromium.org>
> Reviewed-by: Manu Cornet <manucornet@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#751200}

TBR=tbarzic@chromium.org,manucornet@chromium.org,yulunwu@chromium.org

Change-Id: I361894e79bf7bb027f690f5a6310874341d51ecf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1058617
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108525Reviewed-by: Dan H <harringtond@chromium.org>
Commit-Queue: Dan H <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751360}