This changeset reverts some or all edits made in changesets 167120612, 171031059, 171031520, 171034487, 171075763, 171120132, 171122970, 171124186, 171124387, 171125041, 171128889, 171129471, 171307169, 171307378, 171307728, 171308280, 171308658, 171308901, 171309544, 171309780, 171310903, 171398977, 171400394, 171401865, 171402841, 171403029, 171739590, 171739798, 171739889, 171740242, 171740760, 171766364, 171772891, 171773957, 171781287, 171782576, 171782611, 171784084, 171786889, 171787732, 171789130, 171789705, 172014984, 172016197, 172016753, 172017775, 172019225, 172104407, 172105229, 172117345, 172117776, 172118131, 172152022, 172161297, 172163614, 172164543, 172165760, 172166195, 172333909, 172707263, 172918870, 173265951, 173267486, 173273390, 173276115, 173276525, 173278651, 173302038, 173302498, 173311934, 173312197, 173316020, 173316994, 173318187, 173318203, 173541503, 173711250, 173920854, 173921145, 173928569.