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This change:
1) Removes ConfirmBubbleModel::GetButtons(), because every user had both
   buttons. Design-wise this makes sense - a ConfirmBubbleModel represents a
   yes/no choice, so having one or both of the buttons absent doesn't make much
   sense.
2) Removes ConfirmBubbleModel::BubbleButton, which duplicates ui::DialogButton
3) Removes ConfirmBubbleViews::IsDialogButtonEnabled() - because of point (1),
   this always returned true.

Bug: 1011446
Change-Id: I04bf65b7145ce00d70887feef1d0a6d218255697
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028217
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736878}