The ornamental design of a boatwindshieldassembly, as shown and described.
FIG. 1 is a front left perspective view showing elements of a boat windshield assembly showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof
FIG. 5 is a rear elevational view thereof
FIG. 6 is a right side elevational view thereof
FIG. 7 is a left side elevational view thereof;
FIG. 8 is an angled top view taken from the rear thereof; and,
FIG. 9 is a front left perspective view of FIG. 1.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environmental and are for illustrative purposes only; the broken lines form no part of the claimed design.