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This reverts commit 0a25dcde.

Reason for revert: Suspected of making DialogTest.InitialFocusWithDeactivatedWidget very flaky on Mac

Bug:949911

Original change's description:
> Make dialogs not draggable (Widgets with MODAL_TYPE_NONE remain
> draggable).
> 
> This change makes the title area of a dialog act as the client. Also
> removed code so system menu does not appear on dialogs. This makes more
> sense since the system dialog has properties such as move (which is now
> illegal, also it doesn't work), and resize (illegal), and close with
> hints of using Alt+F4 (Alt+F4 does not close dialogs).
> 
> Bug: 930782
> Change-Id: I0956b85df2c3059af7b38b63ccf8774ccd150158
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536198
> Commit-Queue: Charlene Yan <cyan@chromium.org>
> Reviewed-by: Trent Apted <tapted@chromium.org>
> Reviewed-by: Bret Sepulveda <bsep@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#647985}

TBR=tapted@chromium.org,bsep@chromium.org,cyan@chromium.org

Change-Id: I800192f4a32822b68b9027f0b7b1ebcab9e22684
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 930782
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1553544Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648116}