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 our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof;
FIG. 9 is another rear perspective view thereof with an environmental stylus pen; and,
FIG. 10 is a cross sectional view taken along line 10-10′ of FIG. 2.
The evenly dashed broken lines in the figures depict portions of the case for electronic device and environmental subject matter that form no part of the claimed design.