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This CL introduces no behavior changes, it just moves from a model with:

  (UiToUse + QuietUiReason)

to:

  Decision = (QuietUiReason + WarningReason),

where either being base::nullopt indicates that the normal UI should be
used, or no warning should be printed, respectively.

Bug: 1087005, 1081233
Change-Id: I90563d2fc245f2f25a132566f394d74dd22c2f70
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218309
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772654}