[Autofill Assistant] Handle value field in FormValueMatch.

Bug: b/119554665

Change-Id: I9087ab89ff72f083d9fc97512a539026551e4fb4
Reviewed-on: https://chromium-review.googlesource.com/c/1365441
Commit-Queue: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614670}
4 files changed