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The platform side may want to close the in-session auth dialog (for
example in WebAuthn when the browser issues a timeout). Expose a
DBus API for dismissing the dialog. This will have the same effect
as if the user clicks the Cancel button.

Change-Id: I9ab2456967d08c382302ee528b0aa6cc2a0d01c5
Bug: b/167574666
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499180Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827370}