Revert "Add new class with APIs of varying visibility"

This reverts commit 7d6704e4.

The experiment has concluded, and we don't want these APIs in
the finalized R api.

Also update the newly-arrived module txt files.

Bug: 149108482
Test: m checkapi
Change-Id: I965111b9a8ad2d3e5849bd9dfdae9c00cc471ce6