Fix unregisterFrame logic.
Fix unregisterFrame logic.

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