Revert "Allow "experimental" class to be always loadable."

This reverts commit 9e771969.

Reason for revert: Droidmonitor created revert due to b/436895296. Will be verifying through ABTD before submission.

Fix: 436895296
Bug: 292141694
Change-Id: I7d103609024466c8423ed69d2e4ddff0d7984c91