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Draggability was never part of the requirements, and making this
dialog draggable results in a visual glitch where the dialog
appears (but isn't actuallly) duplicated when switching from
laptop to tablet mode.

Bug: 1072049
Change-Id: I1a1eeae93d1c4c537131371e05531a1fa2c553b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209550Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Dan S <danan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770387}