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This reverts commit 6cb8f1ee.

Reason for revert: Could this be causing BookmarkBarViewTest22.CloseSourceBrowserDuringDrag failures?

[0602/000817.871182:ERROR:test_launcher.cc(1041)] no test result for BookmarkBarViewTest22.CloseSourceBrowserDuringDrag
[ RUN      ] BookmarkBarViewTest22.CloseSourceBrowserDuringDrag
X Error of failed request:  BadWindow (invalid Window parameter)
  Major opcode of failed request:  25 (X_SendEvent)
  Resource id in failed request:  0x600010
  Serial number of failed request:  560
  Current serial number in output stream:  563
[144/291] BookmarkBarViewTest22.CloseSourceBrowserDuringDrag (159 ms)

https://ci.chromium.org/p/chromium/builders/ci/Linux%20Tests
https://chromium-swarm.appspot.com/task?id=4c8cabe25bd9e510#BookmarkBarViewTest22.CloseSourceBrowserDuringDrag,WebViewFocusInteractiveTest.Focus_FocusEvent

Original change's description:
> [ozone/x11] Moved the DnD handling from X11WindowOzone to X11Window.
> 
> This CL is the first step that prepares us to get rid of DWTHX11.
> 
> As we proceed with that, at some point we will have to throw off the
> DesktopDragDropClientAuraX11 because it is used by DWTHX11, and migrate
> DnD to DDDCOzone.  As the latter will be used on both Ozone and
> non-Ozone, it needs the X11window to handle DnD.
> 
> Hence this change.  I move the DnD-related code from X11WindowOzone into
> X11Window.
> 
> Change-Id: I682c794d9cfab4b7ad6b6a9b89331526f31d227a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213578
> Reviewed-by: Maksim Sisov <msisov@igalia.com>
> Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#774026}

TBR=thomasanderson@chromium.org,msisov@igalia.com,adunaev@igalia.com

Change-Id: I2d5147265dab2e820bcb5467530df280f0bf1823
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2223945Reviewed-by: Thiemo Nagel <tnagel@chromium.org>
Commit-Queue: Thiemo Nagel <tnagel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774063}