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When a mounting operation failed for an archive, we displayed the errors
in a dialog:
- as part of the error message, the raw error code was included, without
translation.
- only one error dialog could be displayed at a time.

We're now using visual signals instead.

Bug: chromium:1058689
Change-Id: I789663d226c5376db0327b809d9e39af1289ca4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336096
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Reviewed-by: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797069}