Minor refactoring for find-mode history.
Minor refactoring for find-mode history.

cyrixhero/vimium,Robinson10240/vimium,smblott-github/vimium,Lw-Cui/vimium,mrmr1993/vimium,cyrixhero/vimium,PrestanceDesign/vimium,zhangmin510/vimium,douglas-larocca/vimium,willsALMANJ/vimium,tuchangwei/vimium,Aleroniponi/vimium,gdh1995/vimium,hhsue/vimium,elderbas/vimium,justalittlenoob/vimium,tuchangwei/vimium,tuchangwei/vimium,willsALMANJ/vimium,smblott-github/vimium,hhsue/vimium,wildeyes/vimium,borgified/vimium,poacher2k/vimium,PickRelated/vimium,poacher2k/vimium,Lw-Cui/vimium,VPashkov/vimium,dimatter/vimium,philc/vimium,wildeyes/vimium,VPashkov/vimium,csmalin/vimium,borgified/vimium,mrmr1993/vimium,Aleroniponi/vimium,bkudria/vimium,decaffeinate-examples/vimium,Robinson10240/vimium,Aleroniponi/vimium,philc/vimium,elegantwww/vimium,csmalin/vimium,elegantwww/vimium,decaffeinate-examples/vimium,PrestanceDesign/vimium,PickRelated/vimium,justalittlenoob/vimium,VPashkov/vimium,PrestanceDesign/vimium,gdh1995/vimium,Lw-Cui/vimium,dimatter/vimium,douglas-larocca/vimium,mrmr1993/vimium,elegantwww/vimium,willsALMANJ/vimium,zhangmin510/vimium,decaffeinate-examples/vimium,bkudria/vimium,dimatter/vimium,justalittlenoob/vimium,cyrixhero/vimium,smblott-github/vimium,elderbas/vimium,gdh1995/vimium,douglas-larocca/vimium,PickRelated/vimium,hhsue/vimium,wildeyes/vimium,Robinson10240/vimium,philc/vimium,zhangmin510/vimium,elderbas/vimium,borgified/vimium,poacher2k/vimium,bkudria/vimium,csmalin/vimium