GitLab

This removes ButtonListener from BubbleDialogModelHost and adds
Button::PressedCallback versions of MdTextButton and LabelButton
constructors to support it.

Bug: 772945, 1106422
Change-Id: I5a6fc50a714e6ac6701af588d5a428ea291bd008
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398321
Commit-Queue: Peter Boström <pbos@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Auto-Submit: Peter Boström <pbos@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804920}