The ornamental design for an automobile body, as shown and described.
FIG. 1 is a front perspective view of an automobile body showing our new design;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a rear perspective view thereof.
It will be understood that the dashed lines presented in the drawings are for illustration only, and do not form a part of the claimed design.