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This reverts commit 5854b63f.

Reason for revert: failed to build on bot linux-chromeos-rel
details: https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-rel/35381?

Original change's description:
> Add unit tests for drag handle nudge.
> 
> Other changes:
> 
> Add test methods to drag_handle class
> Modified shelf_widget GetDragHandle() to return DragHandle* instead of View*
> Modified DragHandle::ShowDragHandleNudge() to fetch timeout for current pref instead of taking it as an argument.
> Fixed bug where ShowDraghandleNudge did not call handleNudgeShown.
> 
> Bug: 1034168
> Change-Id: Ifde73e31b1e35b630ab61b7ab43d49c9796dce20
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076015
> Auto-Submit: Yulun Wu <yulunwu@chromium.org>
> Reviewed-by: Manu Cornet <manucornet@chromium.org>
> Reviewed-by: Toni Baržić <tbarzic@chromium.org>
> Commit-Queue: Yulun Wu <yulunwu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#745583}

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

Change-Id: Iee2da855a7f8ca0c0cba9689a4319607edbdd108
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1034168
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079204Reviewed-by: Yi Xu <yiyix@chromium.org>
Commit-Queue: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745599}