Refactor ZipScrubberStep
Refactor ZipScrubberStep

Summary: This just simplifies the logic of ZipScrubberStep a bit.

Test Plan: run tests, should be no behavior change

Reviewed By: Coneko

fbshipit-source-id: 620f3b6

grumpyjames/buck,nguyentruongtho/buck,kageiit/buck,ilya-klyuchnikov/buck,k21/buck,robbertvanginkel/buck,Addepar/buck,vschs007/buck,kageiit/buck,daedric/buck,grumpyjames/buck,illicitonion/buck,shs96c/buck,dsyang/buck,sdwilsh/buck,clonetwin26/buck,rmaz/buck,clonetwin26/buck,JoelMarcey/buck,JoelMarcey/buck,dsyang/buck,Addepar/buck,sdwilsh/buck,vschs007/buck,brettwooldridge/buck,facebook/buck,brettwooldridge/buck,shybovycha/buck,romanoid/buck,ilya-klyuchnikov/buck,Addepar/buck,SeleniumHQ/buck,davido/buck,vschs007/buck,ilya-klyuchnikov/buck,Addepar/buck,daedric/buck,robbertvanginkel/buck,k21/buck,zpao/buck,SeleniumHQ/buck,davido/buck,robbertvanginkel/buck,rmaz/buck,shs96c/buck,dsyang/buck,brettwooldridge/buck,k21/buck,shybovycha/buck,zhan-xiong/buck,grumpyjames/buck,marcinkwiatkowski/buck,brettwooldridge/buck,brettwooldridge/buck,justinmuller/buck,SeleniumHQ/buck,shybovycha/buck,marcinkwiatkowski/buck,sdwilsh/buck,LegNeato/buck,dsyang/buck,romanoid/buck,Addepar/buck,clonetwin26/buck,davido/buck,rmaz/buck,marcinkwiatkowski/buck,rmaz/buck,kageiit/buck,zhan-xiong/buck,k21/buck,grumpyjames/buck,brettwooldridge/buck,Addepar/buck,davido/buck,kageiit/buck,kageiit/buck,darkforestzero/buck,romanoid/buck,facebook/buck,grumpyjames/buck,grumpyjames/buck,illicitonion/buck,justinmuller/buck,ilya-klyuchnikov/buck,k21/buck,SeleniumHQ/buck,dsyang/buck,k21/buck,ilya-klyuchnikov/buck,Addepar/buck,marcinkwiatkowski/buck,nguyentruongtho/buck,nguyentruongtho/buck,SeleniumHQ/buck,daedric/buck,rmaz/buck,clonetwin26/buck,clonetwin26/buck,romanoid/buck,clonetwin26/buck,k21/buck,facebook/buck,justinmuller/buck,justinmuller/buck,shybovycha/buck,LegNeato/buck,LegNeato/buck,vschs007/buck,LegNeato/buck,rmaz/buck,davido/buck,marcinkwiatkowski/buck,daedric/buck,daedric/buck,darkforestzero/buck,k21/buck,darkforestzero/buck,shs96c/buck,LegNeato/buck,illicitonion/buck,illicitonion/buck,darkforestzero/buck,vschs007/buck,shybovycha/buck,brettwooldridge/buck,SeleniumHQ/buck,LegNeato/buck,romanoid/buck,sdwilsh/buck,dsyang/buck,LegNeato/buck,JoelMarcey/buck,brettwooldridge/buck,dsyang/buck,zhan-xiong/buck,daedric/buck,darkforestzero/buck,marcinkwiatkowski/buck,sdwilsh/buck,shs96c/buck,JoelMarcey/buck,daedric/buck,robbertvanginkel/buck,justinmuller/buck,illicitonion/buck,Addepar/buck,shybovycha/buck,shybovycha/buck,davido/buck,shybovycha/buck,davido/buck,shybovycha/buck,sdwilsh/buck,rmaz/buck,sdwilsh/buck,shs96c/buck,SeleniumHQ/buck,darkforestzero/buck,ilya-klyuchnikov/buck,sdwilsh/buck,LegNeato/buck,rmaz/buck,clonetwin26/buck,romanoid/buck,shybovycha/buck,zhan-xiong/buck,clonetwin26/buck,illicitonion/buck,robbertvanginkel/buck,robbertvanginkel/buck,zpao/buck,sdwilsh/buck,brettwooldridge/buck,dsyang/buck,JoelMarcey/buck,justinmuller/buck,grumpyjames/buck,vschs007/buck,SeleniumHQ/buck,dsyang/buck,shs96c/buck,Addepar/buck,clonetwin26/buck,marcinkwiatkowski/buck,facebook/buck,LegNeato/buck,zhan-xiong/buck,Addepar/buck,illicitonion/buck,rmaz/buck,zhan-xiong/buck,daedric/buck,marcinkwiatkowski/buck,JoelMarcey/buck,sdwilsh/buck,darkforestzero/buck,vschs007/buck,robbertvanginkel/buck,zhan-xiong/buck,k21/buck,justinmuller/buck,nguyentruongtho/buck,robbertvanginkel/buck,kageiit/buck,shs96c/buck,darkforestzero/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,zhan-xiong/buck,clonetwin26/buck,darkforestzero/buck,Addepar/buck,illicitonion/buck,k21/buck,zhan-xiong/buck,kageiit/buck,illicitonion/buck,nguyentruongtho/buck,ilya-klyuchnikov/buck,clonetwin26/buck,robbertvanginkel/buck,darkforestzero/buck,facebook/buck,daedric/buck,clonetwin26/buck,zpao/buck,JoelMarcey/buck,rmaz/buck,rmaz/buck,SeleniumHQ/buck,k21/buck,vschs007/buck,shs96c/buck,darkforestzero/buck,ilya-klyuchnikov/buck,dsyang/buck,marcinkwiatkowski/buck,LegNeato/buck,vschs007/buck,rmaz/buck,brettwooldridge/buck,dsyang/buck,clonetwin26/buck,romanoid/buck,LegNeato/buck,grumpyjames/buck,JoelMarcey/buck,LegNeato/buck,marcinkwiatkowski/buck,marcinkwiatkowski/buck,shybovycha/buck,sdwilsh/buck,zhan-xiong/buck,romanoid/buck,sdwilsh/buck,robbertvanginkel/buck,nguyentruongtho/buck,justinmuller/buck,justinmuller/buck,daedric/buck,brettwooldridge/buck,JoelMarcey/buck,illicitonion/buck,grumpyjames/buck,dsyang/buck,JoelMarcey/buck,shs96c/buck,davido/buck,nguyentruongtho/buck,SeleniumHQ/buck,shs96c/buck,shs96c/buck,shybovycha/buck,ilya-klyuchnikov/buck,zpao/buck,JoelMarcey/buck,rmaz/buck,facebook/buck,grumpyjames/buck,k21/buck,darkforestzero/buck,davido/buck,dsyang/buck,robbertvanginkel/buck,vschs007/buck,k21/buck,romanoid/buck,grumpyjames/buck,romanoid/buck,illicitonion/buck,darkforestzero/buck,justinmuller/buck,robbertvanginkel/buck,shs96c/buck,davido/buck,grumpyjames/buck,davido/buck,brettwooldridge/buck,marcinkwiatkowski/buck,zpao/buck,sdwilsh/buck,facebook/buck,romanoid/buck,marcinkwiatkowski/buck,justinmuller/buck,JoelMarcey/buck,davido/buck,Addepar/buck,shybovycha/buck,davido/buck,illicitonion/buck,daedric/buck,JoelMarcey/buck,zpao/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,daedric/buck,ilya-klyuchnikov/buck,justinmuller/buck,zpao/buck,zhan-xiong/buck,Addepar/buck,vschs007/buck,robbertvanginkel/buck,SeleniumHQ/buck,brettwooldridge/buck,zhan-xiong/buck,vschs007/buck,vschs007/buck,shs96c/buck,justinmuller/buck,zhan-xiong/buck,daedric/buck,LegNeato/buck,romanoid/buck,romanoid/buck,ilya-klyuchnikov/buck,illicitonion/buck