remove unused function
remove unused function


Former-commit-id: 6faba28edccafce272de05d50975b253d1225e1d [formerly 6faba28edccafce272de05d50975b253d1225e1d [formerly 67648269527cde6125378b6491e7b1a4e5d002c9]]
Former-commit-id: 77e93fd74f96ade349c3502931d9876479c69354
Former-commit-id: feb84dc855cbab15995d9f832af008db6db554c6
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine