The ornamental design for an exterior facing surfaceconfiguration of a frontbumper for an automobile, as shown and described.
FIG. 1 is a front view of an exterior facing surface configuration of a
front bumper for an automobile according to my novel design;
FIG. 2 is a bottom view of an exterior facing surface configuration of a
front bumper for an automobile according to my novel design;
FIG. 3 is a top view of an exterior facing surface configuration of a front
bumper for an automobile according to my novel design;
FIG. 4 is a side view from the left of an exterior facing surface
configuration of a front bumper for an automobile according to my novel
design, which is mirror image of the side view from the right; and,
FIG. 5 is a perspective view from the front left of an exterior facing
configuration of a front bumper for an automobile according to my novel
design.