DeviceDisplayResolution: Don't show popup for policy-forced resolution

Whenever resolution is changed for an external display, popup was shown
suggesting user to rollback changes. This CL hides the popup for
policy-forced changes.

Bug: 938859
Change-Id: Iadb11ccac9c2cb5c2cc90bc4f71a127042ae9800
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1505933
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Zakhar Voit <voit@google.com>
Cr-Commit-Position: refs/heads/master@{#642448}
15 files changed