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Although these are in XFA-callbacks, which we do not ship, call out
other places where we'd not want to provide full support.

- Remove some partial code from these functions.

Change-Id: I0de38c161982e1830a9c9b51f1a0c06fb6f7e3c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947805Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720828}