Gary Levin, USA TODAY Summer finales: HBO's The Newsroom drew a modest 1.7 million viewers for Sunday's second-season finale, opposite Showtime's penultimate Dexter (2.4 million) and the third-to-last episode of AMC's Breaking Bad (6.4 million, another series high). Other finales: ABC's Mistresses (3.9 million viewers Monday) and Rookie Blue (4.7 million Thursday); Fox's Masterchef (6.3 million...