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This change was started in crrev.com/c/1814619 but is a no-op on Mac
without the changes in this CL. This only changes the drag+drop
behavior of users with the appropriate policies enabled and doesn't
affect other users.

Bug: 1046921
Change-Id: I3603ae28a730472e6f88f0281c72720c4a71be03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037450Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738971}