The ornamental design for a chainbracelet, as shown and described.
FIG. 1 is a top perspective view of a chain bracelet;
FIG. 2 is a side elevational view thereof;
FIG. 3 is an enlarged sectional view of several bracelet links (shown as section 3 in FIG. 2) shown separately for completeness of illustration; and,
FIG. 4 is a top plan view thereof.
The broken lines shown in FIG. 2 define the boundaries of a portion of the design which is shown enlarged in FIG. 3 and form no part of the claimed design.