Revert "Support histogram annotations stats-log-api-gen" Revert submission 3471820-hist-gen Reason for revert: Droidmonitor created revert due to b/398875908. Will be verifying through ABTD before submission. Reverted changes: /q/submissionid:3471820-hist-gen Change-Id: I9c08342d8df9679ca085a273bc872dc70e3fc7ec