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This change removes CrostiniAppRestartView, replacing it with:
* Construction and configuration of a bare View + DialogDelegate pair
* A pair of public functions that create and show this dialog

This change also adds some unit test coverage for this dialog to
ensure that I didn't break it when doing this refactor.

Bug: 1075649
Change-Id: I7de0e2386de14aa6aec8917c630f64a69df26832
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490345
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819545}