Hard to answer this without background info on the size of the room, number of windows, frames of the mirrors etc.
Chocolate Brown as an accent wall color can be tricky. Darker colors make your living room look smaller, while mirrors make it look bigger. That's probably creating some conflict.
If you're counting on these mirrors to look great and open up your room due to a lack of incoming natural light, go with lighter walls.
If the mirrors are for show, maybe you stick with the one dark wall to use as a background and a middle of the road color, like a latte, for the other walls.
If that's too boring, go with a Robin's Egg Blue on the other 3 walls. For a reference on how that will look, check out our Twitter box on the right. If your furniture and accents have some warmer reds in them, that will pull the two colors together well.