[Autofill Assistant] Remove dead code

Bug: 806868
Change-Id: I3c8504f809ade7c4c3c3f942d2581978f4e84460
Reviewed-on: https://chromium-review.googlesource.com/c/1427783
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Auto-Submit: Ganggui Tang <gogerald@chromium.org>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624950}
1 file changed