The ornamental design for a combinedtoothbrushsanitizingholder and tray, as shown and described.
FIG. 1 is a top, front and left side perspective view of a combined
toothbrush sanitizing holder and tray showing my new design, the right
side being substantially similar in appearance to that shown;
FIG. 2 is a rear elevational view thereof; and
FIG. 3 is a top, front and left side perspective view of an alternate
embodiment thereof, the only difference residing in its depth.