Added assert for lb_token before reffing it
Added assert for lb_token before reffing it

muxi/grpc,grpc/grpc,greasypizza/grpc,ctiller/grpc,baylabs/grpc,Vizerai/grpc,soltanmm-google/grpc,ejona86/grpc,soltanmm-google/grpc,apolcyn/grpc,grpc/grpc,pmarks-net/grpc,pmarks-net/grpc,philcleveland/grpc,makdharma/grpc,yongni/grpc,infinit/grpc,Crevil/grpc,zhimingxie/grpc,jtattermusch/grpc,zhimingxie/grpc,carl-mastrangelo/grpc,rjshade/grpc,matt-kwong/grpc,deepaklukose/grpc,msmania/grpc,kpayson64/grpc,deepaklukose/grpc,LuminateWireless/grpc,Vizerai/grpc,yang-g/grpc,vsco/grpc,chrisdunelm/grpc,adelez/grpc,MakMukhi/grpc,matt-kwong/grpc,pmarks-net/grpc,quizlet/grpc,jboeuf/grpc,nicolasnoble/grpc,soltanmm-google/grpc,kriswuollett/grpc,infinit/grpc,pszemus/grpc,mehrdada/grpc,kriswuollett/grpc,hstefan/grpc,fuchsia-mirror/third_party-grpc,thunderboltsid/grpc,jtattermusch/grpc,firebase/grpc,thunderboltsid/grpc,makdharma/grpc,daniel-j-born/grpc,makdharma/grpc,PeterFaiman/ruby-grpc-minimal,muxi/grpc,royalharsh/grpc,adelez/grpc,soltanmm-google/grpc,rjshade/grpc,simonkuang/grpc,apolcyn/grpc,dklempner/grpc,pszemus/grpc,vjpai/grpc,carl-mastrangelo/grpc,adelez/grpc,kpayson64/grpc,vsco/grpc,7anner/grpc,kumaralokgithub/grpc,zhimingxie/grpc,ejona86/grpc,greasypizza/grpc,mehrdada/grpc,ejona86/grpc,baylabs/grpc,msmania/grpc,vjpai/grpc,kriswuollett/grpc,LuminateWireless/grpc,geffzhang/grpc,MakMukhi/grpc,wcevans/grpc,nicolasnoble/grpc,zhimingxie/grpc,Crevil/grpc,grpc/grpc,Crevil/grpc,Vizerai/grpc,mehrdada/grpc,MakMukhi/grpc,MakMukhi/grpc,ejona86/grpc,wcevans/grpc,rjshade/grpc,nicolasnoble/grpc,sreecha/grpc,yang-g/grpc,nicolasnoble/grpc,yongni/grpc,greasypizza/grpc,MakMukhi/grpc,LuminateWireless/grpc,fuchsia-mirror/third_party-grpc,dklempner/grpc,murgatroid99/grpc,philcleveland/grpc,pszemus/grpc,carl-mastrangelo/grpc,msmania/grpc,wcevans/grpc,Vizerai/grpc,deepaklukose/grpc,Vizerai/grpc,infinit/grpc,dgquintas/grpc,baylabs/grpc,grani/grpc,msmania/grpc,chrisdunelm/grpc,quizlet/grpc,hstefan/grpc,grpc/grpc,soltanmm-google/grpc,jtattermusch/grpc,murgatroid99/grpc,ejona86/grpc,pmarks-net/grpc,muxi/grpc,7anner/grpc,ctiller/grpc,ejona86/grpc,mehrdada/grpc,ncteisen/grpc,wcevans/grpc,dklempner/grpc,infinit/grpc,PeterFaiman/ruby-grpc-minimal,pszemus/grpc,thinkerou/grpc,wcevans/grpc,pszemus/grpc,dklempner/grpc,murgatroid99/grpc,a11r/grpc,dgquintas/grpc,grani/grpc,vsco/grpc,yang-g/grpc,donnadionne/grpc,ctiller/grpc,pszemus/grpc,deepaklukose/grpc,ipylypiv/grpc,Crevil/grpc,kpayson64/grpc,ncteisen/grpc,LuminateWireless/grpc,a11r/grpc,philcleveland/grpc,murgatroid99/grpc,chrisdunelm/grpc,dgquintas/grpc,stanley-cheung/grpc,ncteisen/grpc,baylabs/grpc,ncteisen/grpc,ipylypiv/grpc,mehrdada/grpc,thinkerou/grpc,MakMukhi/grpc,dklempner/grpc,sreecha/grpc,stanley-cheung/grpc,ipylypiv/grpc,kskalski/grpc,carl-mastrangelo/grpc,dgquintas/grpc,thunderboltsid/grpc,ipylypiv/grpc,ipylypiv/grpc,mehrdada/grpc,hstefan/grpc,baylabs/grpc,jboeuf/grpc,muxi/grpc,hstefan/grpc,7anner/grpc,soltanmm-google/grpc,sreecha/grpc,stanley-cheung/grpc,ejona86/grpc,nicolasnoble/grpc,kskalski/grpc,simonkuang/grpc,ncteisen/grpc,zhimingxie/grpc,yugui/grpc,LuminateWireless/grpc,kriswuollett/grpc,7anner/grpc,pszemus/grpc,infinit/grpc,mehrdada/grpc,grani/grpc,daniel-j-born/grpc,ctiller/grpc,greasypizza/grpc,thinkerou/grpc,matt-kwong/grpc,kriswuollett/grpc,ppietrasa/grpc,carl-mastrangelo/grpc,donnadionne/grpc,ejona86/grpc,matt-kwong/grpc,adelez/grpc,apolcyn/grpc,chrisdunelm/grpc,kskalski/grpc,jtattermusch/grpc,geffzhang/grpc,firebase/grpc,dgquintas/grpc,ppietrasa/grpc,daniel-j-born/grpc,sreecha/grpc,kumaralokgithub/grpc,ipylypiv/grpc,hstefan/grpc,matt-kwong/grpc,stanley-cheung/grpc,ipylypiv/grpc,donnadionne/grpc,firebase/grpc,kpayson64/grpc,baylabs/grpc,adelez/grpc,firebase/grpc,grpc/grpc,Crevil/grpc,sreecha/grpc,a11r/grpc,simonkuang/grpc,kumaralokgithub/grpc,kskalski/grpc,geffzhang/grpc,kumaralokgithub/grpc,ncteisen/grpc,carl-mastrangelo/grpc,ctiller/grpc,muxi/grpc,adelez/grpc,a11r/grpc,firebase/grpc,muxi/grpc,royalharsh/grpc,dklempner/grpc,7anner/grpc,yugui/grpc,zhimingxie/grpc,yongni/grpc,pmarks-net/grpc,chrisdunelm/grpc,chrisdunelm/grpc,wcevans/grpc,royalharsh/grpc,zhimingxie/grpc,msmania/grpc,greasypizza/grpc,yugui/grpc,simonkuang/grpc,vsco/grpc,firebase/grpc,donnadionne/grpc,yang-g/grpc,yang-g/grpc,baylabs/grpc,adelez/grpc,kriswuollett/grpc,vjpai/grpc,pszemus/grpc,yugui/grpc,stanley-cheung/grpc,chrisdunelm/grpc,fuchsia-mirror/third_party-grpc,yang-g/grpc,thinkerou/grpc,yugui/grpc,adelez/grpc,greasypizza/grpc,kpayson64/grpc,matt-kwong/grpc,fuchsia-mirror/third_party-grpc,ctiller/grpc,muxi/grpc,jboeuf/grpc,makdharma/grpc,dklempner/grpc,jboeuf/grpc,daniel-j-born/grpc,carl-mastrangelo/grpc,ipylypiv/grpc,stanley-cheung/grpc,Crevil/grpc,vsco/grpc,ppietrasa/grpc,kskalski/grpc,stanley-cheung/grpc,LuminateWireless/grpc,ncteisen/grpc,thinkerou/grpc,pszemus/grpc,adelez/grpc,nicolasnoble/grpc,greasypizza/grpc,grani/grpc,fuchsia-mirror/third_party-grpc,grpc/grpc,ctiller/grpc,infinit/grpc,ejona86/grpc,grani/grpc,jboeuf/grpc,ctiller/grpc,grpc/grpc,grani/grpc,daniel-j-born/grpc,philcleveland/grpc,jboeuf/grpc,muxi/grpc,donnadionne/grpc,yang-g/grpc,infinit/grpc,PeterFaiman/ruby-grpc-minimal,vjpai/grpc,kumaralokgithub/grpc,PeterFaiman/ruby-grpc-minimal,kpayson64/grpc,hstefan/grpc,nicolasnoble/grpc,royalharsh/grpc,vsco/grpc,wcevans/grpc,kumaralokgithub/grpc,rjshade/grpc,geffzhang/grpc,geffzhang/grpc,murgatroid99/grpc,thinkerou/grpc,thunderboltsid/grpc,simonkuang/grpc,jboeuf/grpc,sreecha/grpc,nicolasnoble/grpc,a11r/grpc,yongni/grpc,fuchsia-mirror/third_party-grpc,carl-mastrangelo/grpc,vjpai/grpc,mehrdada/grpc,thinkerou/grpc,a11r/grpc,vjpai/grpc,thunderboltsid/grpc,deepaklukose/grpc,yongni/grpc,donnadionne/grpc,a11r/grpc,firebase/grpc,kpayson64/grpc,thunderboltsid/grpc,quizlet/grpc,ppietrasa/grpc,vjpai/grpc,ejona86/grpc,royalharsh/grpc,geffzhang/grpc,nicolasnoble/grpc,deepaklukose/grpc,7anner/grpc,baylabs/grpc,rjshade/grpc,grani/grpc,kumaralokgithub/grpc,donnadionne/grpc,geffzhang/grpc,thinkerou/grpc,ppietrasa/grpc,stanley-cheung/grpc,yang-g/grpc,yongni/grpc,Crevil/grpc,ncteisen/grpc,rjshade/grpc,greasypizza/grpc,daniel-j-born/grpc,Vizerai/grpc,quizlet/grpc,jtattermusch/grpc,kskalski/grpc,thinkerou/grpc,quizlet/grpc,LuminateWireless/grpc,apolcyn/grpc,LuminateWireless/grpc,chrisdunelm/grpc,makdharma/grpc,infinit/grpc,mehrdada/grpc,kskalski/grpc,msmania/grpc,firebase/grpc,thinkerou/grpc,matt-kwong/grpc,kpayson64/grpc,sreecha/grpc,dgquintas/grpc,murgatroid99/grpc,Vizerai/grpc,Vizerai/grpc,hstefan/grpc,yongni/grpc,royalharsh/grpc,rjshade/grpc,quizlet/grpc,kriswuollett/grpc,donnadionne/grpc,PeterFaiman/ruby-grpc-minimal,firebase/grpc,yugui/grpc,matt-kwong/grpc,deepaklukose/grpc,daniel-j-born/grpc,royalharsh/grpc,jtattermusch/grpc,yugui/grpc,pszemus/grpc,ctiller/grpc,MakMukhi/grpc,kskalski/grpc,royalharsh/grpc,vsco/grpc,7anner/grpc,jtattermusch/grpc,kpayson64/grpc,donnadionne/grpc,Vizerai/grpc,firebase/grpc,msmania/grpc,vjpai/grpc,wcevans/grpc,daniel-j-born/grpc,a11r/grpc,Crevil/grpc,grani/grpc,kriswuollett/grpc,hstefan/grpc,matt-kwong/grpc,grpc/grpc,rjshade/grpc,makdharma/grpc,PeterFaiman/ruby-grpc-minimal,mehrdada/grpc,muxi/grpc,thunderboltsid/grpc,fuchsia-mirror/third_party-grpc,murgatroid99/grpc,PeterFaiman/ruby-grpc-minimal,Vizerai/grpc,yang-g/grpc,vjpai/grpc,nicolasnoble/grpc,jtattermusch/grpc,simonkuang/grpc,philcleveland/grpc,apolcyn/grpc,firebase/grpc,kumaralokgithub/grpc,simonkuang/grpc,geffzhang/grpc,grpc/grpc,grpc/grpc,sreecha/grpc,pmarks-net/grpc,donnadionne/grpc,7anner/grpc,deepaklukose/grpc,ncteisen/grpc,ctiller/grpc,nicolasnoble/grpc,quizlet/grpc,nicolasnoble/grpc,baylabs/grpc,muxi/grpc,MakMukhi/grpc,dgquintas/grpc,kumaralokgithub/grpc,muxi/grpc,simonkuang/grpc,grani/grpc,ppietrasa/grpc,donnadionne/grpc,grpc/grpc,thinkerou/grpc,murgatroid99/grpc,quizlet/grpc,makdharma/grpc,carl-mastrangelo/grpc,carl-mastrangelo/grpc,vjpai/grpc,yugui/grpc,grpc/grpc,royalharsh/grpc,thinkerou/grpc,vjpai/grpc,carl-mastrangelo/grpc,philcleveland/grpc,rjshade/grpc,hstefan/grpc,kpayson64/grpc,msmania/grpc,ncteisen/grpc,kriswuollett/grpc,jtattermusch/grpc,fuchsia-mirror/third_party-grpc,yugui/grpc,philcleveland/grpc,simonkuang/grpc,vsco/grpc,jboeuf/grpc,donnadionne/grpc,daniel-j-born/grpc,dgquintas/grpc,MakMukhi/grpc,vjpai/grpc,makdharma/grpc,ppietrasa/grpc,philcleveland/grpc,ejona86/grpc,mehrdada/grpc,mehrdada/grpc,7anner/grpc,chrisdunelm/grpc,zhimingxie/grpc,greasypizza/grpc,PeterFaiman/ruby-grpc-minimal,ejona86/grpc,yongni/grpc,kpayson64/grpc,a11r/grpc,carl-mastrangelo/grpc,zhimingxie/grpc,thunderboltsid/grpc,dgquintas/grpc,pmarks-net/grpc,jboeuf/grpc,apolcyn/grpc,sreecha/grpc,fuchsia-mirror/third_party-grpc,jtattermusch/grpc,quizlet/grpc,pszemus/grpc,stanley-cheung/grpc,chrisdunelm/grpc,ppietrasa/grpc,thunderboltsid/grpc,pszemus/grpc,chrisdunelm/grpc,PeterFaiman/ruby-grpc-minimal,murgatroid99/grpc,deepaklukose/grpc,soltanmm-google/grpc,apolcyn/grpc,sreecha/grpc,ncteisen/grpc,apolcyn/grpc,dgquintas/grpc,sreecha/grpc,sreecha/grpc,stanley-cheung/grpc,geffzhang/grpc,yongni/grpc,PeterFaiman/ruby-grpc-minimal,jboeuf/grpc,fuchsia-mirror/third_party-grpc,ncteisen/grpc,dklempner/grpc,stanley-cheung/grpc,dgquintas/grpc,LuminateWireless/grpc,infinit/grpc,vsco/grpc,soltanmm-google/grpc,jtattermusch/grpc,soltanmm-google/grpc,Crevil/grpc,kskalski/grpc,dklempner/grpc,pmarks-net/grpc,ipylypiv/grpc,makdharma/grpc,jtattermusch/grpc,stanley-cheung/grpc,firebase/grpc,apolcyn/grpc,wcevans/grpc,philcleveland/grpc,pmarks-net/grpc,msmania/grpc,murgatroid99/grpc,ctiller/grpc,Vizerai/grpc,jboeuf/grpc,ppietrasa/grpc,jboeuf/grpc,ctiller/grpc,muxi/grpc