The ornamental design for a barriercover, as shown and described.
FIG. 1 is a perspective view of a barrier cover;
FIG. 2 is a front elevation view or a rear elevation view thereof;
FIG. 3 is a right side elevation view or a left side elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a perspective environmental view thereof positioned on a barrier; and,
FIG. 7 is a perspective view of a barrier cover, wherein the barrier cover is made of a fabric.
The broken lines are for illustrative purposes only and form no part of the claimed design. Any portion between the break lines forms no part of the claimed design.