Chelsea residents rallied Monday to protest the death of an 8-year-old child pedestrian -- the latest victim of Ninth Ave. traffic."Kumo's death is not an accident, it's part of a deadly pattern," Christine Berthet said of Prince "Kumo" Harris, Jr., the child who was struck at the corner of Ninth Ave. and 17th St. on Oct 5. He died the next day. "This residential corridor is used as a highway and is getting more dangerous for seniors and children with every passing year