Mobile computing device

FIG. 1 is a front perspective view of an ornamental design for a mobile computing device;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Broken lines and entirely unshaded portions contained within broken lines are not claimed.