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This reverts commit 330fc4a1.

Reason for revert: speculative revert to fix views_unittests (https://bugs.chromium.org/p/chromium/issues/detail?id=859829).

Original change's description:
> Make all MacViews windows potentially draggable.
>
> This fixes the PiP window not being draggable on Mac.
>
> Bug: 849983
> Change-Id: I1b0f503de1a1f154f23afd1870943a6b7009be75
> Reviewed-on: https://chromium-review.googlesource.com/1121145
> Commit-Queue: Sidney San Martín <sdy@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#572038}

TBR=avi@chromium.org,sdy@chromium.org

Change-Id: Ic1e718a03d272c2c1b4646ead018ad776d03fd18
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 849983,859829
Reviewed-on: https://chromium-review.googlesource.com/1124299
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572161}