[AF] Add two missing metadata functions into AutofillTable

This CL adds functions needed by the new wallet metadata sync bridge.

Bug: 853688
Change-Id: I4b1e1c7aee0b5016eae4d7b3dd3c790d3ccf5a54
Reviewed-on: https://chromium-review.googlesource.com/c/1405509
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621949}
3 files changed