We claim the ornamental design for an electronic device skin, as shown and described.
FIG. 1 is a front perspective view of an electronic device skin;
FIG. 2 is a back perspective view of the electronic device skin;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a back elevational view thereof;
FIG. 5 is a left elevational view thereof;
FIG. 6 is a right elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines shown in the drawings of the electronic device skin are for the purpose of illustrating portions of the article that form no part of the claimed design.