The ornamental design for a toybar for a driven infant seat, as shown and described.
FIG. 1 is a front perspective view of the toy bar for a driven infant seat showing our new design in association with an infant seat in broken lines;
FIG. 2 is a front elevation view thereof shown without the infant seat;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side plan view thereof;
FIG. 6 is a right side plan view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines showing the infant seat and lower end portion of the toy bar are for illustrative purposes only and form no part of the claimed design.