Fix compiler errors in gcc4.4 and 4.6
Fix compiler errors in gcc4.4 and 4.6

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