The ornamental design for a collapsibledebrischute, as shown and described.
FIG. 1 is a perspective view of a collapsible debris chute showing our new design;
FIG. 2 is a view in front elevation thereof with the view in rear elevation being a mirror image thereof;
FIG. 3 is a top plan view thereof; and,
FIG. 4 is a bottom plan view thereof.
The shading in the figures is fragmentarily shown for convenience of illustration, it being understood that the shading is uniformly continued over the surface on which it appears.