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AuthDialogController is called by UserAuthenticationServiceProvider
and is responsible for managing authentication dialogs and talking
to chromeos::ExtendedAuthenticator. The authentication functionality
is not implemented yet.

AuthDialogController is exported publicly because AuthDialogClient
(to be implemented) in Chrome needs to find it.

Bug: b:156258540
Change-Id: I4a8904c25431b1267d01b7ecce0400fbe9f00569
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298542Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792774}