Harvard said on Saturday that a law professor who is representing Harvey Weinstein would not continue as faculty dean of an undergraduate house after his term ends on June 30, bowing to months of pressure from students. The professor, Ronald S. Sullivan Jr., and his wife, Stephanie Robinson, who is a lecturer at the law school, have been the faculty deans of Winthrop House, one of Harvard’s residential houses for undergraduate students, since 2009. They were the first African-American faculty deans in Harvard’s history.