Revert "Prevent restoring focus when the EndDrag minimizes the window"

This reverts commit d9b555828b2f49b9b9d223384d98e7a1f43ec5d9.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Prevent restoring focus when the EndDrag minimizes the window
> 
> Some gesture may minimize the window along with ending the drag,
> but TabDragController::RestoreFocus in EndDragImpl() cancels
> the minimization.
> 
> Bug: 902897
> Test: the new test case
> Change-Id: I3b19ef228d69b141eee5f18fbf130cccb4745d6b
> Reviewed-on: https://chromium-review.googlesource.com/c/1377490
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Jun Mukai <mukai@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#616856}

TBR=mukai@chromium.org,sky@chromium.org

Change-Id: Ic047835d96904b59c6be0c47ce357af2a07e2856
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 902897
Reviewed-on: https://chromium-review.googlesource.com/c/1379168
Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616884}
2 files changed