Show normalized labels

Shows normalized labels for Autofill prediction improvements if present.
Otherwise falls back to regular labels / placeholders (as before).

No-op: Instead of using the field value for suggestions / filling,
this CL makes use of the first entry in the list of predicted values
(for now).

Fixed: 369135360
Change-Id: Icff2d153eeb257da79d2230a9fc8c78f6ddec03d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5895832
Commit-Queue: Wolfgang Billenstein <bwolfgang@google.com>
Reviewed-by: Bruno Braga <brunobraga@google.com>
Cr-Commit-Position: refs/heads/main@{#1362282}