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This is a reland of 37dea4b3
Wasn't actually the culprit of failing tests.

Original change's description:
> Update message in permission dialog overlay warning
>
> The current overlay warning message does not directly address the
> typical case: when dialer or chat bubble is displayed on the screen.
>
> One change in behavior is that "Cancel" button of overlay warning dialog
> dismisses both overlay warning and permission dialog.
>
> BUG=1127455
> R=twellington@chromium.org
>
> Change-Id: I9d5c13a6c7d4e52a3fa73b3193d1ef463272ab64
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406148
> Reviewed-by: Theresa  <twellington@chromium.org>
> Reviewed-by: Andy Paicu <andypaicu@chromium.org>
> Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#807089}

Bug: 1127455
Change-Id: Ia973a989f70d4a094b0d620b4ae4970482d21fc9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414672Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Pavel Yatsuk <pavely@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Auto-Submit: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#807937}