Revert "Add IsMonotonic to j.l.r.Field."

Revert submission 33804628-monotonic-unreflect

Reason for revert: LUCI failures

Reverted changes: /q/submissionid:33804628-monotonic-unreflect

Change-Id: I109b2b4c821558ef440005c377d20487e3fa3cdb
2 files changed