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This reverts commit f524b7f0.

Reason for revert: I will add a simple fix.

Original change's description:
> Revert "Change ButtonPressed overrides to callbacks: c/b/ui/views/sharesheet/"
>
> This reverts commit 1ac9a1da.
>
> Reason for revert: Breaking UI
>
> Original change's description:
> > Change ButtonPressed overrides to callbacks: c/b/ui/views/sharesheet/
> >
> > This allows converting |targets_| from a member to a parameter that's
> > passed around.  I also did some other cleanup while there.
> >
> > Bug: 772945
> > Change-Id: Iaa7f70594ba109d1598da3566856e90c8b09629d
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2481246
> > Commit-Queue: Melissa Zhang <melzhang@chromium.org>
> > Reviewed-by: Melissa Zhang <melzhang@chromium.org>
> > Auto-Submit: Peter Kasting <pkasting@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#818324}
>
> TBR=pkasting@chromium.org,melzhang@chromium.org
>
> Change-Id: Ief930a27f44caef219bf782a7534ef8bc76d83ef
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 772945
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2483745
> Reviewed-by: Melissa Zhang <melzhang@chromium.org>
> Commit-Queue: Melissa Zhang <melzhang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#818357}

TBR=pkasting@chromium.org,melzhang@chromium.org

# Not skipping CQ checks because this is a reland.

Bug: 772945
Change-Id: I00d7acd3d7c812dfde8b584c2e53b6b2e1c237a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2483987Reviewed-by: Melissa Zhang <melzhang@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818379}