Since all platforms are now enabling subpixel layout, the roundedLayoutPoint is useless as it just returns the point it received.
Actually, I changed my mind and I think the cleanup should happen together with removing the compile time flag. If we removed this function while there's still a compile time flag to disable subpixel, platforms couldn't actually revert back to fully non-subpixel. (There's a very little chance for it, but for the sake of correctness, let's leave it like this for now)