Remove unused method, according to discussion:
https://github.com/Mind4SE/mind-compiler/commit/66eafde33416cb9a677be94011cc39e8fc4e9b23#commitcomment-5031718
https://github.com/Mind4SE/mind-compiler/commit/66eafde33416cb9a677be94011cc39e8fc4e9b23#commitcomment-5341996
https://github.com/Mind4SE/mind-compiler/commit/66eafde33416cb9a677be94011cc39e8fc4e9b23#commitcomment-5619088