The ornamental design for a chairbucket, as shown and described.
FIG. 1 is a perspective view showing our new design, the broken lines are for environmental purposes only and form no part of the claimed design;
FIG. 2 is a front view of the chair bucket illustrated in FIG. 1, the broken lines are for environmental purposes only and form no part of the claimed design;
FIG. 3 is a first side view of the chair bucket illustrated in FIG. 1, the opposite side view being a mirror image of the first side view, the broken lines are for environmental purposes only and form no part of the claimed design;
FIG. 4 is a top view of the chair bucket illustrated in FIG. 1, the broken lines are for environmental purposes only and form no part of the claimed design;
FIG. 5 is a bottom view of the chair bucket illustrated in FIG. 1, the broken lines are for environmental purposes only and form no part of the claimed design; and,
FIG. 6 is a rear view of the chair bucket illustrated in FIG. 1, the broken lines are for environmental purposes only and form no part of the claimed design.