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 t hereof;
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 broken lines depict portions of the case for electronic device that form no part of the claimed design. The dash-dot-dash boundary lines represent boundaries of the claim and form no part of the claim.