The ornamental design for a chairarm, as shown and described.
FIG. 1 is a side elevational view of a chair arm showing my new design, the
opposite side being a mirror image thereof; FIG. 2 is a three quarter side
elevational view of a chair arm showing my new design, the opposite side
being a mirror image thereof; FIG. 3 is a three quarter front elevational
view of a chair arm showing my new design, the opposite side being a
mirror image thereof; FIG. 4 is top view of a chair arm showing my new
design; FIG. 5 is a bottom view; FIG. 6 is a front elevational view of a
chair arm showing my new design; and, FIG. 7 is a rear elevational view of
a chair arm showing my new design. The broken line showing of a chair is
for illustrative purposes only and forms no part of the claimed design.