The ornamental design for a case for electronicdevice, as shown and described.
FIG. 1 is a front perspective view of a case for electronic device showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The dashed broken lines in the drawings depict portions of the case for electronic device that form no part of the claim. The dash-dot broken lines define the boundaries of the claim that form no part of the claim.