FIG. 1 is a front isometric view of a case for electronic device showing our new design;

FIG. 2 is a rear isometric view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines immediately adjacent the claimed surfaces represent boundaries of the claimed design. All other broken lines depict unclaimed environment. The broken lines form no part of the claimed design.