Remove unused legacy BeginForTree methods (#1082)
Remove unused legacy BeginForTree methods (#1082)


gdbelvin/trillian,gdbelvin/trillian,Martin2112/trillian,AlCutter/trillian,Martin2112/trillian,RJPercival/trillian,Martin2112/trillian,daviddrysdale/trillian,daviddrysdale/trillian,google/trillian,RJPercival/trillian,google/trillian,gdbelvin/trillian,daviddrysdale/trillian,AlCutter/trillian