The ornamental design for a cosmeticcontainer, as shown and described.
FIG. 1 is a perspective view of a cosmetic container;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left elevational side view thereof;
FIG. 5 is a right elevational side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a perspective view thereof, the broken line showing of the recessed part is for illustrative purposes only and forms no part of the claimed design; and,