Remove dead properties on format_token.
Remove dead properties on format_token.

hayd/yapf,google/yapf,wklken/yapf,sbc100/yapf,ambv/yapf,dmoliveira/yapf,nikolamilosevic86/yapf,lucius-feng/yapf,bygloam/yapf,google/yapf,jamesblunt/yapf,elviswf/yapf,sbc100/yapf,abduld/yapf,thurday/yapf