The ornamental design for a surface configuration of a front bumper for a vehicle, as shown and described.
FIG. 1 is a left, perspective view of a surface configuration of a front bumper for a vehicle according to my novel design, the right, perspective view being mirror symmetrical;
FIG. 2 is a front view of the surface configuration of a front bumper for a vehicle according to my novel design; and,
FIG. 3 is a right side view of the surface configuration of a front bumper for a vehicle according to my novel design, the left side view being mirror symmetrical.
The broken lines included depict environment and are not part of the claimed design. Also enclosed is a set of photographs of an embodiment of my invention.