remove some unneeded parent classes.
remove some unneeded parent classes.


Former-commit-id: a900c2ac78ef34803f8a0f9539e2c42d3b66fab3
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine