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In case of an error (or generally stopping the flow), the usual
suspects were cleared. The form was not and stayed visible.
Upon interaction with the form in a shut-down state, the system
would crash.

This is not easily reproducible in normal use but may appear when
tab switching is enabled.

Bug: b/143753128
Change-Id: I3301f1299fe6a40fe3780752aa3b92b32becc538
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893999Reviewed-by: Clemens Arbesser <arbesser@google.com>
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Cr-Commit-Position: refs/heads/master@{#711702}