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Before this patch, we stopped autofill assistant with an error message
when the cvc step got cancelled. We are currently not able to
distinguish between a bad cvc and cancel.

This patch makes a first step towards a nicer flow where stop script
becomes a graceful shutdown with a status message.

Bug: 806868
Change-Id: I5d0e3f74d21f54df1276f994be2ae8c798fa2c0f
Reviewed-on: https://chromium-review.googlesource.com/c/1331394
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607247}