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This change begins breaking dependencies outside //ui/views on
DialogClientView. The overarching goal here is to make DialogClientView
private to //ui/views, with DialogDelegate presenting the only interface
for clients of Views to manage/interact with dialogs. This will also
make it easier to move some logic (ie: the AcceptDialog/CancelDialog
wrappers this change adds) entirely into DialogDelegate later on.

Bug: 1011446
Change-Id: I49c1b435ff57faf41beae7b51c6a5f430f0631cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912805Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715269}