With the final four episodes of “Breaking Bad” looming last fall, Vince Gilligan hinted to EW, “A great many chickens will come home to roost for Walt.” And, sure enough, in “Ozymandias,” the third-to-last episode of AMC’s harrowing, Emmy-winning meth drama, many of said chickens knocked down the front door of his house and made themselves comfortable in his living room.