Don't unregister resolver object until callback complete
Don't unregister resolver object until callback complete

Prevents TSAN races in iomgr shutdown code

chrisdunelm/grpc,ctiller/grpc,kriswuollett/grpc,tempbottle/grpc,deepaklukose/grpc,muxi/grpc,JoeWoo/grpc,perumaalgoog/grpc,kskalski/grpc,goldenbull/grpc,yang-g/grpc,Vizerai/grpc,vsco/grpc,thunderboltsid/grpc,stanley-cheung/grpc,kumaralokgithub/grpc,surround-io/grpc,grpc/grpc,ofrobots/grpc,bjori/grpc,meisterpeeps/grpc,rjshade/grpc,sreecha/grpc,perumaalgoog/grpc,infinit/grpc,nicolasnoble/grpc,thunderboltsid/grpc,wangyikai/grpc,a11r/grpc,miselin/grpc,ofrobots/grpc,pmarks-net/grpc,murgatroid99/grpc,sreecha/grpc,jcanizales/grpc,ncteisen/grpc,madongfly/grpc,donnadionne/grpc,kskalski/grpc,y-zeng/grpc,jboeuf/grpc,larsonmpdx/grpc,maxwell-demon/grpc,ctiller/grpc,mehrdada/grpc,deepaklukose/grpc,a-veitch/grpc,grani/grpc,fuchsia-mirror/third_party-grpc,ofrobots/grpc,muxi/grpc,malexzx/grpc,leifurhauks/grpc,vjpai/grpc,Crevil/grpc,jcanizales/grpc,rjshade/grpc,larsonmpdx/grpc,jtattermusch/grpc,thinkerou/grpc,jtattermusch/grpc,kriswuollett/grpc,vjpai/grpc,chrisdunelm/grpc,arkmaxim/grpc,PeterFaiman/ruby-grpc-minimal,soltanmm-google/grpc,thunderboltsid/grpc,LuminateWireless/grpc,xtopsoft/grpc,msiedlarek/grpc,gpndata/grpc,thinkerou/grpc,mehrdada/grpc,msmania/grpc,Crevil/grpc,hstefan/grpc,jcanizales/grpc,fichter/grpc,soltanmm/grpc,grpc/grpc,tempbottle/grpc,thinkerou/grpc,Vizerai/grpc,andrewpollock/grpc,philcleveland/grpc,murgatroid99/grpc,thunderboltsid/grpc,madongfly/grpc,ksophocleous/grpc,ncteisen/grpc,a-veitch/grpc,ncteisen/grpc,wangyikai/grpc,zhimingxie/grpc,doubi-workshop/grpc,fichter/grpc,baylabs/grpc,pszemus/grpc,meisterpeeps/grpc,JoeWoo/grpc,apolcyn/grpc,muxi/grpc,tengyifei/grpc,goldenbull/grpc,pszemus/grpc,a11r/grpc,dklempner/grpc,grpc/grpc,wangyikai/grpc,philcleveland/grpc,vjpai/grpc,ppietrasa/grpc,ncteisen/grpc,nicolasnoble/grpc,kpayson64/grpc,a11r/grpc,ejona86/grpc,crast/grpc,daniel-j-born/grpc,firebase/grpc,arkmaxim/grpc,vsco/grpc,ppietrasa/grpc,rjshade/grpc,gpndata/grpc,tengyifei/grpc,quizlet/grpc,fuchsia-mirror/third_party-grpc,thinkerou/grpc,7anner/grpc,leifurhauks/grpc,VcamX/grpc,sreecha/grpc,MakMukhi/grpc,infinit/grpc,firebase/grpc,madongfly/grpc,malexzx/grpc,fichter/grpc,daniel-j-born/grpc,chrisdunelm/grpc,carl-mastrangelo/grpc,simonkuang/grpc,miselin/grpc,carl-mastrangelo/grpc,y-zeng/grpc,cgvarela/grpc,carl-mastrangelo/grpc,maxwell-demon/grpc,stanley-cheung/grpc,meisterpeeps/grpc,leifurhauks/grpc,andrewpollock/grpc,VcamX/grpc,jboeuf/grpc,podsvirov/grpc,bjori/grpc,fuchsia-mirror/third_party-grpc,greasypizza/grpc,ppietrasa/grpc,doubi-workshop/grpc,LuminateWireless/grpc,fichter/grpc,gpndata/grpc,JoeWoo/grpc,yang-g/grpc,a11r/grpc,geffzhang/grpc,quizlet/grpc,doubi-workshop/grpc,JoeWoo/grpc,ejona86/grpc,royalharsh/grpc,grpc/grpc,tamihiro/grpc,ejona86/grpc,cgvarela/grpc,simonkuang/grpc,firebase/grpc,wcevans/grpc,a-veitch/grpc,donnadionne/grpc,meisterpeeps/grpc,chrisdunelm/grpc,7anner/grpc,ananthonline/grpc,royalharsh/grpc,arkmaxim/grpc,chrisdunelm/grpc,w4-sjcho/grpc,jboeuf/grpc,Crevil/grpc,sreecha/grpc,ananthonline/grpc,bogdandrutu/grpc,donnadionne/grpc,surround-io/grpc,tamihiro/grpc,soltanmm/grpc,sreecha/grpc,crast/grpc,deepaklukose/grpc,ppietrasa/grpc,pmarks-net/grpc,y-zeng/grpc,royalharsh/grpc,tamihiro/grpc,muxi/grpc,jboeuf/grpc,yugui/grpc,donnadionne/grpc,kskalski/grpc,kriswuollett/grpc,donnadionne/grpc,leifurhauks/grpc,VcamX/grpc,wcevans/grpc,MakMukhi/grpc,baylabs/grpc,andrewpollock/grpc,maxwell-demon/grpc,wcevans/grpc,murgatroid99/grpc,jtattermusch/grpc,infinit/grpc,pmarks-net/grpc,xtopsoft/grpc,malexzx/grpc,daniel-j-born/grpc,soltanmm-google/grpc,donnadionne/grpc,fichter/grpc,jcanizales/grpc,wangyikai/grpc,murgatroid99/grpc,grpc/grpc,dklempner/grpc,soltanmm-google/grpc,vjpai/grpc,carl-mastrangelo/grpc,mehrdada/grpc,kriswuollett/grpc,sreecha/grpc,carl-mastrangelo/grpc,simonkuang/grpc,tamihiro/grpc,tamihiro/grpc,grani/grpc,yinsu/grpc,tengyifei/grpc,murgatroid99/grpc,ctiller/grpc,murgatroid99/grpc,podsvirov/grpc,ejona86/grpc,PeterFaiman/ruby-grpc-minimal,dgquintas/grpc,jboeuf/grpc,larsonmpdx/grpc,thinkerou/grpc,maxwell-demon/grpc,jtattermusch/grpc,Vizerai/grpc,w4-sjcho/grpc,bogdandrutu/grpc,quizlet/grpc,yinsu/grpc,PeterFaiman/ruby-grpc-minimal,vsco/grpc,adelez/grpc,jboeuf/grpc,kpayson64/grpc,surround-io/grpc,stanley-cheung/grpc,malexzx/grpc,msiedlarek/grpc,rjshade/grpc,xtopsoft/grpc,jboeuf/grpc,yugui/grpc,carl-mastrangelo/grpc,chrisdunelm/grpc,LuminateWireless/grpc,wcevans/grpc,mehrdada/grpc,a-veitch/grpc,surround-io/grpc,adelez/grpc,w4-sjcho/grpc,gpndata/grpc,PeterFaiman/ruby-grpc-minimal,daniel-j-born/grpc,a11r/grpc,doubi-workshop/grpc,matt-kwong/grpc,larsonmpdx/grpc,infinit/grpc,cgvarela/grpc,ejona86/grpc,w4-sjcho/grpc,geffzhang/grpc,a-veitch/grpc,podsvirov/grpc,thinkerou/grpc,tengyifei/grpc,MakMukhi/grpc,ejona86/grpc,y-zeng/grpc,philcleveland/grpc,ncteisen/grpc,y-zeng/grpc,bogdandrutu/grpc,tengyifei/grpc,vjpai/grpc,apolcyn/grpc,tamihiro/grpc,baylabs/grpc,greasypizza/grpc,mehrdada/grpc,gpndata/grpc,PeterFaiman/ruby-grpc-minimal,firebase/grpc,sreecha/grpc,podsvirov/grpc,xtopsoft/grpc,yang-g/grpc,miselin/grpc,malexzx/grpc,grpc/grpc,carl-mastrangelo/grpc,soltanmm-google/grpc,goldenbull/grpc,tengyifei/grpc,grani/grpc,fuchsia-mirror/third_party-grpc,VcamX/grpc,larsonmpdx/grpc,malexzx/grpc,gpndata/grpc,dgquintas/grpc,yinsu/grpc,firebase/grpc,carl-mastrangelo/grpc,MakMukhi/grpc,thunderboltsid/grpc,jboeuf/grpc,MakMukhi/grpc,apolcyn/grpc,soltanmm/grpc,thinkerou/grpc,greasypizza/grpc,adelez/grpc,a-veitch/grpc,bjori/grpc,doubi-workshop/grpc,matt-kwong/grpc,ncteisen/grpc,cgvarela/grpc,pmarks-net/grpc,perumaalgoog/grpc,dgquintas/grpc,ofrobots/grpc,mehrdada/grpc,MakMukhi/grpc,grpc/grpc,adelez/grpc,LuminateWireless/grpc,malexzx/grpc,simonkuang/grpc,murgatroid99/grpc,simonkuang/grpc,msmania/grpc,surround-io/grpc,philcleveland/grpc,a-veitch/grpc,kpayson64/grpc,wangyikai/grpc,ncteisen/grpc,ipylypiv/grpc,yongni/grpc,hstefan/grpc,yugui/grpc,wcevans/grpc,donnadionne/grpc,kskalski/grpc,a11r/grpc,madongfly/grpc,w4-sjcho/grpc,soltanmm-google/grpc,mehrdada/grpc,perumaalgoog/grpc,jcanizales/grpc,yugui/grpc,zhimingxie/grpc,carl-mastrangelo/grpc,goldenbull/grpc,vjpai/grpc,bogdandrutu/grpc,pszemus/grpc,bjori/grpc,yang-g/grpc,grani/grpc,chrisdunelm/grpc,maxwell-demon/grpc,y-zeng/grpc,apolcyn/grpc,bjori/grpc,grpc/grpc,daniel-j-born/grpc,soltanmm-google/grpc,matt-kwong/grpc,arkmaxim/grpc,hstefan/grpc,ppietrasa/grpc,nicolasnoble/grpc,VcamX/grpc,kskalski/grpc,yongni/grpc,crast/grpc,jtattermusch/grpc,andrewpollock/grpc,msiedlarek/grpc,ejona86/grpc,nicolasnoble/grpc,dklempner/grpc,a11r/grpc,kpayson64/grpc,ksophocleous/grpc,crast/grpc,w4-sjcho/grpc,ananthonline/grpc,adelez/grpc,quizlet/grpc,LuminateWireless/grpc,vjpai/grpc,kpayson64/grpc,mehrdada/grpc,philcleveland/grpc,yongni/grpc,tengyifei/grpc,hstefan/grpc,goldenbull/grpc,perumaalgoog/grpc,crast/grpc,arkmaxim/grpc,ncteisen/grpc,sreecha/grpc,kumaralokgithub/grpc,yinsu/grpc,tengyifei/grpc,carl-mastrangelo/grpc,greasypizza/grpc,msmania/grpc,miselin/grpc,soltanmm-google/grpc,VcamX/grpc,fuchsia-mirror/third_party-grpc,jtattermusch/grpc,simonkuang/grpc,LuminateWireless/grpc,stanley-cheung/grpc,ctiller/grpc,deepaklukose/grpc,dgquintas/grpc,muxi/grpc,muxi/grpc,podsvirov/grpc,bjori/grpc,podsvirov/grpc,7anner/grpc,Vizerai/grpc,zhimingxie/grpc,bjori/grpc,soltanmm/grpc,kumaralokgithub/grpc,jboeuf/grpc,jcanizales/grpc,PeterFaiman/ruby-grpc-minimal,tamihiro/grpc,leifurhauks/grpc,ananthonline/grpc,jtattermusch/grpc,JoeWoo/grpc,bogdandrutu/grpc,surround-io/grpc,apolcyn/grpc,ejona86/grpc,PeterFaiman/ruby-grpc-minimal,cgvarela/grpc,vsco/grpc,pmarks-net/grpc,thunderboltsid/grpc,larsonmpdx/grpc,msmania/grpc,tamihiro/grpc,doubi-workshop/grpc,larsonmpdx/grpc,crast/grpc,soltanmm-google/grpc,xtopsoft/grpc,baylabs/grpc,podsvirov/grpc,wcevans/grpc,makdharma/grpc,infinit/grpc,philcleveland/grpc,adelez/grpc,yang-g/grpc,wangyikai/grpc,grpc/grpc,matt-kwong/grpc,leifurhauks/grpc,dklempner/grpc,ananthonline/grpc,7anner/grpc,ppietrasa/grpc,deepaklukose/grpc,infinit/grpc,tamihiro/grpc,grani/grpc,kskalski/grpc,dklempner/grpc,zhimingxie/grpc,soltanmm/grpc,grpc/grpc,pmarks-net/grpc,rjshade/grpc,surround-io/grpc,PeterFaiman/ruby-grpc-minimal,VcamX/grpc,msmania/grpc,7anner/grpc,Crevil/grpc,kpayson64/grpc,yang-g/grpc,mehrdada/grpc,madongfly/grpc,arkmaxim/grpc,nicolasnoble/grpc,vsco/grpc,yongni/grpc,tengyifei/grpc,yugui/grpc,royalharsh/grpc,msiedlarek/grpc,wangyikai/grpc,philcleveland/grpc,kumaralokgithub/grpc,andrewpollock/grpc,dklempner/grpc,yinsu/grpc,grpc/grpc,ksophocleous/grpc,MakMukhi/grpc,grani/grpc,zhimingxie/grpc,tempbottle/grpc,baylabs/grpc,mehrdada/grpc,ofrobots/grpc,philcleveland/grpc,msmania/grpc,arkmaxim/grpc,jcanizales/grpc,dklempner/grpc,kpayson64/grpc,muxi/grpc,kumaralokgithub/grpc,stanley-cheung/grpc,muxi/grpc,kpayson64/grpc,yinsu/grpc,fuchsia-mirror/third_party-grpc,Vizerai/grpc,fichter/grpc,makdharma/grpc,matt-kwong/grpc,soltanmm/grpc,madongfly/grpc,ananthonline/grpc,greasypizza/grpc,podsvirov/grpc,philcleveland/grpc,w4-sjcho/grpc,kskalski/grpc,ipylypiv/grpc,ppietrasa/grpc,chrisdunelm/grpc,vsco/grpc,7anner/grpc,nicolasnoble/grpc,kumaralokgithub/grpc,leifurhauks/grpc,dgquintas/grpc,crast/grpc,stanley-cheung/grpc,ctiller/grpc,murgatroid99/grpc,ncteisen/grpc,yinsu/grpc,zhimingxie/grpc,kriswuollett/grpc,dgquintas/grpc,msmania/grpc,greasypizza/grpc,makdharma/grpc,cgvarela/grpc,nicolasnoble/grpc,firebase/grpc,mehrdada/grpc,bogdandrutu/grpc,daniel-j-born/grpc,thinkerou/grpc,miselin/grpc,ipylypiv/grpc,hstefan/grpc,kpayson64/grpc,pszemus/grpc,wcevans/grpc,ctiller/grpc,dklempner/grpc,Crevil/grpc,surround-io/grpc,chrisdunelm/grpc,ejona86/grpc,deepaklukose/grpc,y-zeng/grpc,yongni/grpc,ananthonline/grpc,ctiller/grpc,jboeuf/grpc,y-zeng/grpc,w4-sjcho/grpc,ofrobots/grpc,hstefan/grpc,deepaklukose/grpc,yugui/grpc,leifurhauks/grpc,nicolasnoble/grpc,vsco/grpc,dgquintas/grpc,muxi/grpc,donnadionne/grpc,matt-kwong/grpc,bogdandrutu/grpc,a-veitch/grpc,VcamX/grpc,yongni/grpc,LuminateWireless/grpc,apolcyn/grpc,larsonmpdx/grpc,vsco/grpc,wangyikai/grpc,perumaalgoog/grpc,greasypizza/grpc,jtattermusch/grpc,jboeuf/grpc,xtopsoft/grpc,ctiller/grpc,kskalski/grpc,ipylypiv/grpc,adelez/grpc,bogdandrutu/grpc,simonkuang/grpc,leifurhauks/grpc,yongni/grpc,yang-g/grpc,zhimingxie/grpc,Crevil/grpc,madongfly/grpc,thinkerou/grpc,ofrobots/grpc,vjpai/grpc,pszemus/grpc,donnadionne/grpc,madongfly/grpc,thinkerou/grpc,goldenbull/grpc,sreecha/grpc,ipylypiv/grpc,yongni/grpc,matt-kwong/grpc,tempbottle/grpc,stanley-cheung/grpc,muxi/grpc,yinsu/grpc,geffzhang/grpc,wcevans/grpc,grani/grpc,adelez/grpc,andrewpollock/grpc,jcanizales/grpc,a-veitch/grpc,carl-mastrangelo/grpc,miselin/grpc,ejona86/grpc,soltanmm-google/grpc,ksophocleous/grpc,infinit/grpc,PeterFaiman/ruby-grpc-minimal,yugui/grpc,kumaralokgithub/grpc,kriswuollett/grpc,miselin/grpc,jcanizales/grpc,fichter/grpc,geffzhang/grpc,rjshade/grpc,donnadionne/grpc,malexzx/grpc,msiedlarek/grpc,carl-mastrangelo/grpc,LuminateWireless/grpc,meisterpeeps/grpc,Crevil/grpc,perumaalgoog/grpc,nicolasnoble/grpc,ksophocleous/grpc,fuchsia-mirror/third_party-grpc,bjori/grpc,larsonmpdx/grpc,msiedlarek/grpc,stanley-cheung/grpc,tempbottle/grpc,fichter/grpc,meisterpeeps/grpc,dgquintas/grpc,royalharsh/grpc,a11r/grpc,makdharma/grpc,yugui/grpc,kpayson64/grpc,kumaralokgithub/grpc,madongfly/grpc,msiedlarek/grpc,tempbottle/grpc,infinit/grpc,infinit/grpc,royalharsh/grpc,baylabs/grpc,ksophocleous/grpc,kriswuollett/grpc,VcamX/grpc,Vizerai/grpc,JoeWoo/grpc,murgatroid99/grpc,kumaralokgithub/grpc,doubi-workshop/grpc,thinkerou/grpc,zhimingxie/grpc,cgvarela/grpc,jtattermusch/grpc,zhimingxie/grpc,ipylypiv/grpc,ejona86/grpc,soltanmm/grpc,firebase/grpc,gpndata/grpc,geffzhang/grpc,kriswuollett/grpc,stanley-cheung/grpc,fuchsia-mirror/third_party-grpc,apolcyn/grpc,firebase/grpc,MakMukhi/grpc,thunderboltsid/grpc,7anner/grpc,baylabs/grpc,yongni/grpc,a11r/grpc,dgquintas/grpc,geffzhang/grpc,xtopsoft/grpc,geffzhang/grpc,y-zeng/grpc,ksophocleous/grpc,grpc/grpc,ctiller/grpc,malexzx/grpc,jtattermusch/grpc,stanley-cheung/grpc,daniel-j-born/grpc,yinsu/grpc,fuchsia-mirror/third_party-grpc,andrewpollock/grpc,bjori/grpc,mehrdada/grpc,quizlet/grpc,andrewpollock/grpc,dgquintas/grpc,7anner/grpc,doubi-workshop/grpc,vjpai/grpc,daniel-j-born/grpc,murgatroid99/grpc,perumaalgoog/grpc,ctiller/grpc,quizlet/grpc,gpndata/grpc,arkmaxim/grpc,msiedlarek/grpc,rjshade/grpc,vjpai/grpc,makdharma/grpc,pszemus/grpc,ananthonline/grpc,pmarks-net/grpc,nicolasnoble/grpc,PeterFaiman/ruby-grpc-minimal,wangyikai/grpc,soltanmm/grpc,Vizerai/grpc,fuchsia-mirror/third_party-grpc,cgvarela/grpc,soltanmm/grpc,ananthonline/grpc,apolcyn/grpc,Vizerai/grpc,goldenbull/grpc,MakMukhi/grpc,yugui/grpc,w4-sjcho/grpc,adelez/grpc,xtopsoft/grpc,ncteisen/grpc,dgquintas/grpc,ofrobots/grpc,miselin/grpc,geffzhang/grpc,bogdandrutu/grpc,kskalski/grpc,goldenbull/grpc,pmarks-net/grpc,7anner/grpc,wcevans/grpc,royalharsh/grpc,firebase/grpc,rjshade/grpc,ipylypiv/grpc,stanley-cheung/grpc,crast/grpc,rjshade/grpc,vjpai/grpc,maxwell-demon/grpc,muxi/grpc,ksophocleous/grpc,kriswuollett/grpc,simonkuang/grpc,maxwell-demon/grpc,Crevil/grpc,quizlet/grpc,baylabs/grpc,stanley-cheung/grpc,msmania/grpc,makdharma/grpc,matt-kwong/grpc,hstefan/grpc,Crevil/grpc,grani/grpc,makdharma/grpc,baylabs/grpc,ppietrasa/grpc,pszemus/grpc,firebase/grpc,miselin/grpc,makdharma/grpc,sreecha/grpc,ppietrasa/grpc,ctiller/grpc,ncteisen/grpc,simonkuang/grpc,meisterpeeps/grpc,chrisdunelm/grpc,ipylypiv/grpc,perumaalgoog/grpc,nicolasnoble/grpc,vsco/grpc,matt-kwong/grpc,vjpai/grpc,daniel-j-born/grpc,ncteisen/grpc,LuminateWireless/grpc,goldenbull/grpc,maxwell-demon/grpc,ipylypiv/grpc,sreecha/grpc,pszemus/grpc,pszemus/grpc,tempbottle/grpc,msmania/grpc,geffzhang/grpc,pszemus/grpc,andrewpollock/grpc,ofrobots/grpc,deepaklukose/grpc,sreecha/grpc,pmarks-net/grpc,royalharsh/grpc,chrisdunelm/grpc,Vizerai/grpc,thunderboltsid/grpc,thinkerou/grpc,Vizerai/grpc,firebase/grpc,hstefan/grpc,dklempner/grpc,greasypizza/grpc,msiedlarek/grpc,ctiller/grpc,yang-g/grpc,firebase/grpc,deepaklukose/grpc,Vizerai/grpc,JoeWoo/grpc,donnadionne/grpc,makdharma/grpc,arkmaxim/grpc,quizlet/grpc,grani/grpc,quizlet/grpc,nicolasnoble/grpc,doubi-workshop/grpc,pszemus/grpc,kpayson64/grpc,donnadionne/grpc,royalharsh/grpc,apolcyn/grpc,muxi/grpc,jtattermusch/grpc,thunderboltsid/grpc,pszemus/grpc,hstefan/grpc,tempbottle/grpc,greasypizza/grpc,jboeuf/grpc,ejona86/grpc,maxwell-demon/grpc,jtattermusch/grpc,podsvirov/grpc,JoeWoo/grpc,meisterpeeps/grpc,JoeWoo/grpc,yang-g/grpc