I claim the design for a vanity base, as shown and described.
FIG. 1 is an upper front right perspective view of a vanity base of my design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front plan view thereof;
FIG. 5 is a rear plan view thereof;
FIG. 6 is an enlarged right side plan view thereof, the left side plan view being a mirror image thereof;
FIG. 7 is an upper front right perspective view of a second embodiment of a vanity base of my design;
FIG. 8 is an enlarged top plan view thereof;
FIG. 9 is a bottom plan view thereof;
FIG. 10 is a front plan view thereof;
FIG. 11 is an enlarged rear plan view thereof; and,
FIG. 12 is an enlarged right side plan view thereof, the left side plan view being a mirror image thereof.
The broken lines shown in the drawings are included for the purpose of illustrating a portion of the vanity base that forms no part of the claimed design.