I claim the ornamental design for the safety razor holder, as shown and described.
FIG. 1 is a front elevation view of a safety razor holder showing my new design:
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side elevational view thereof; and,
FIG. 6 is a left side elevational view thereof.
The broken lines connecting the outer solid lines along the head of the elongated safety razor holder represent the bounds of the claim. The remaining broken lines illustrate portions of the article. None of the broken lines form part of the claimed design.