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The passed callback is stored and called from OnInstallPromptDone which
is itself a callback passed to ShowDialog. ShowDialog is already a
OnceCallback so this method will only be called once (and we convert the
call to BindOnce). Further, we already clear the |callback_| member when
calling it (using std::move) so this can be safely made a OnceCallback.

Bug: 1152268
Change-Id: Ib1ad3d92c239403a35ad9d226304b6f92dfc80d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601061Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838972}