* lisp/window.el: Use lexical-binding

* lisp/window.el: Use lexical-binding

(window--min-size-ignore-p): Remove unused arg `horizontal'.
(window--sanitize-window-sizes): Remove unused arg `frame'.
(window-edges): Remove unused vars left-off and right-off.
(display-buffer-reuse-mode-window): Remove unused var `frame?'.
Avoid extraneous setq and do a bit of CSE.
(fit-frame-to-buffer): Remove unused vars `window', `fit-width',
and `toolbar-extra-height'.
(window-adjust-process-window-size): Remove unused arg `process'.