The ornamental design for a headrest for automobileseat, as shown and described.
FIG. 1 is a front perspective view of a headrest for automobile seat, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof; and,
FIG. 9 is a perspective view thereof as shown in an automobile seat environment.
The dot-dash broken lines in the figures depict a boundary of the claimed design and form no part of the claimed design. The broken lines depicting portions of the headrest for automobile seat and environmental structures form no part of the claimed design.