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This reverts commit 400c3bba.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 665601 as the
culprit for flakes in the build cycles as shown on:
https://analysis.chromium.org/p/chromium/flake-portal/analysis/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vNDAwYzNiYmE5YmEwMTRiYmJmODk5YzA3YzVjOTllNjJkZTliYWVjYgw

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.win/Win7%20Tests%20%281%29/92132

Sample Failed Step: content_browsertests

Sample Flaky Test: WebContentsViewAuraTest.DragDropOnOopif

Original change's description:
> Use async targeting to find drag and drop targets
> 
> Add callback supports to the RenderWidgetTargeter
> and use the async targetting in drag and drop code
> and register a callback to send drag events using
> the callback. Note that since drag and drop events
> aren't WebInputEvent it is not possible to use
> FindTargetAndDispatch function of RenderWidgetTargeter
> at this time.
> 
> The original CL
> https://chromium-review.googlesource.com/c/chromium/src/+/1596840
> was reverted due the added test being flaky. This CL is the same
> as the original CL expect it has the same test with another
> way of checking the logic.
> 
> TBR=sadrul@chromium.org
> 
> Bug: 804633
> Change-Id: I46f15a2b694c3ad9d3574473c2a46ba13dcbfb79
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1641383
> Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
> Commit-Queue: Navid Zolghadr <nzolghadr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#665601}


Change-Id: Ib44e431fa894a33ce908c2f7defb2ae80d399e8d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 804633
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1641515
Cr-Commit-Position: refs/heads/master@{#665633}