[Android][Autofill] Remove unused editor field types.

Every EditorDialog consists of EditorFields. Remove
field types which aren't used before EditorFieldModel is
converted into PropertyModel:

* label field
* icons field
* checkbox field

Bug: 1435314
Change-Id: I6f632bd3163686dd287c048021748cd14921ed47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4547660


Reviewed-by: Friedrich Horschig <fhorschig@chromium.org>
Reviewed-by: Nick Burris <nburris@chromium.org>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Timofey Chudakov <tchudakov@google.com>
Cr-Commit-Position: refs/heads/main@{#1149132}