* nsfns.m (x_icon): icon_top/left is int.

* nsterm.h (EmacsScroller): Replace Lisp_Object win with
struct window*.
Remove getMouseMotionPart.
(ns_output): Make icon_top/left int.

* nsterm.m (ns_mouse_position): Remove unused code.
(initFrame:window:, dealloc): Use window instead of win.
(getMouseMotionPart:window:x:y:): Remove, unused.
(sendScrollEventAtLoc:fromEvent:): Make Lisp_Object win from window.