Remove unnecessary include of std::string. NFC.
Remove unnecessary include of std::string. NFC.

Swift SVN r15546

therealbnut/swift,huonw/swift,kstaring/swift,jckarter/swift,allevato/swift,JaSpa/swift,ahoppen/swift,kstaring/swift,austinzheng/swift,jmgc/swift,codestergit/swift,JGiola/swift,gribozavr/swift,LeoShimonaka/swift,kstaring/swift,roambotics/swift,Jnosh/swift,JaSpa/swift,milseman/swift,kusl/swift,LeoShimonaka/swift,ken0nek/swift,gribozavr/swift,modocache/swift,djwbrown/swift,bitjammer/swift,modocache/swift,shajrawi/swift,kentya6/swift,djwbrown/swift,mightydeveloper/swift,felix91gr/swift,Ivacker/swift,emilstahl/swift,parkera/swift,sschiau/swift,glessard/swift,adrfer/swift,devincoughlin/swift,milseman/swift,bitjammer/swift,devincoughlin/swift,johnno1962d/swift,gmilos/swift,jckarter/swift,austinzheng/swift,djwbrown/swift,arvedviehweger/swift,huonw/swift,danielmartin/swift,ben-ng/swift,rudkx/swift,adrfer/swift,gregomni/swift,arvedviehweger/swift,zisko/swift,kentya6/swift,johnno1962d/swift,return/swift,parkera/swift,jopamer/swift,swiftix/swift.old,hooman/swift,brentdax/swift,tjw/swift,kusl/swift,karwa/swift,milseman/swift,khizkhiz/swift,JaSpa/swift,JGiola/swift,kperryua/swift,aschwaighofer/swift,allevato/swift,harlanhaskins/swift,ben-ng/swift,khizkhiz/swift,therealbnut/swift,shajrawi/swift,tinysun212/swift-windows,ahoppen/swift,shahmishal/swift,gregomni/swift,zisko/swift,adrfer/swift,harlanhaskins/swift,KrishMunot/swift,JGiola/swift,danielmartin/swift,MukeshKumarS/Swift,atrick/swift,deyton/swift,zisko/swift,rudkx/swift,lorentey/swift,airspeedswift/swift,frootloops/swift,bitjammer/swift,tkremenek/swift,JGiola/swift,shahmishal/swift,brentdax/swift,jmgc/swift,IngmarStein/swift,hooman/swift,deyton/swift,ben-ng/swift,uasys/swift,shajrawi/swift,russbishop/swift,lorentey/swift,frootloops/swift,alblue/swift,dduan/swift,return/swift,frootloops/swift,shajrawi/swift,austinzheng/swift,dduan/swift,jopamer/swift,manavgabhawala/swift,slavapestov/swift,IngmarStein/swift,deyton/swift,MukeshKumarS/Swift,johnno1962d/swift,kstaring/swift,benlangmuir/swift,OscarSwanros/swift,sschiau/swift,sdulal/swift,jopamer/swift,russbishop/swift,uasys/swift,kusl/swift,johnno1962d/swift,sdulal/swift,kusl/swift,stephentyrone/swift,huonw/swift,ken0nek/swift,khizkhiz/swift,apple/swift,Ivacker/swift,tinysun212/swift-windows,jopamer/swift,devincoughlin/swift,OscarSwanros/swift,sschiau/swift,codestergit/swift,amraboelela/swift,danielmartin/swift,JaSpa/swift,ben-ng/swift,airspeedswift/swift,amraboelela/swift,djwbrown/swift,xwu/swift,manavgabhawala/swift,harlanhaskins/swift,roambotics/swift,codestergit/swift,uasys/swift,djwbrown/swift,slavapestov/swift,shahmishal/swift,Jnosh/swift,jtbandes/swift,JaSpa/swift,Jnosh/swift,nathawes/swift,shajrawi/swift,tkremenek/swift,therealbnut/swift,kperryua/swift,emilstahl/swift,benlangmuir/swift,kperryua/swift,return/swift,deyton/swift,mightydeveloper/swift,gregomni/swift,codestergit/swift,alblue/swift,gregomni/swift,amraboelela/swift,airspeedswift/swift,allevato/swift,russbishop/swift,OscarSwanros/swift,gmilos/swift,gottesmm/swift,practicalswift/swift,emilstahl/swift,deyton/swift,calebd/swift,natecook1000/swift,swiftix/swift.old,tardieu/swift,lorentey/swift,roambotics/swift,swiftix/swift,khizkhiz/swift,gottesmm/swift,kusl/swift,kperryua/swift,xedin/swift,gribozavr/swift,kentya6/swift,jckarter/swift,apple/swift,sdulal/swift,sschiau/swift,apple/swift,swiftix/swift.old,brentdax/swift,ken0nek/swift,KrishMunot/swift,ken0nek/swift,jopamer/swift,jtbandes/swift,JaSpa/swift,MukeshKumarS/Swift,danielmartin/swift,bitjammer/swift,CodaFi/swift,kentya6/swift,uasys/swift,parkera/swift,CodaFi/swift,lorentey/swift,sdulal/swift,brentdax/swift,KrishMunot/swift,alblue/swift,gottesmm/swift,hughbe/swift,kentya6/swift,adrfer/swift,tjw/swift,jckarter/swift,sschiau/swift,parkera/swift,harlanhaskins/swift,swiftix/swift,IngmarStein/swift,kentya6/swift,atrick/swift,shajrawi/swift,cbrentharris/swift,Jnosh/swift,xwu/swift,LeoShimonaka/swift,codestergit/swift,hughbe/swift,nathawes/swift,return/swift,gribozavr/swift,airspeedswift/swift,felix91gr/swift,karwa/swift,emilstahl/swift,ahoppen/swift,Ivacker/swift,arvedviehweger/swift,modocache/swift,airspeedswift/swift,tardieu/swift,glessard/swift,jmgc/swift,manavgabhawala/swift,slavapestov/swift,karwa/swift,natecook1000/swift,Jnosh/swift,xwu/swift,MukeshKumarS/Swift,swiftix/swift,tjw/swift,felix91gr/swift,aschwaighofer/swift,practicalswift/swift,swiftix/swift,dreamsxin/swift,tardieu/swift,kstaring/swift,nathawes/swift,sdulal/swift,glessard/swift,emilstahl/swift,zisko/swift,parkera/swift,sdulal/swift,JGiola/swift,tardieu/swift,JGiola/swift,glessard/swift,calebd/swift,slavapestov/swift,IngmarStein/swift,gmilos/swift,felix91gr/swift,CodaFi/swift,huonw/swift,allevato/swift,xwu/swift,devincoughlin/swift,milseman/swift,felix91gr/swift,huonw/swift,calebd/swift,frootloops/swift,austinzheng/swift,KrishMunot/swift,natecook1000/swift,ben-ng/swift,calebd/swift,tkremenek/swift,natecook1000/swift,SwiftAndroid/swift,jckarter/swift,rudkx/swift,hughbe/swift,IngmarStein/swift,felix91gr/swift,danielmartin/swift,sschiau/swift,jtbandes/swift,CodaFi/swift,austinzheng/swift,slavapestov/swift,LeoShimonaka/swift,manavgabhawala/swift,shahmishal/swift,hooman/swift,cbrentharris/swift,tjw/swift,gmilos/swift,kusl/swift,zisko/swift,ken0nek/swift,sdulal/swift,therealbnut/swift,jmgc/swift,huonw/swift,tinysun212/swift-windows,hooman/swift,tinysun212/swift-windows,IngmarStein/swift,tardieu/swift,shahmishal/swift,return/swift,xwu/swift,apple/swift,kstaring/swift,rudkx/swift,slavapestov/swift,jckarter/swift,khizkhiz/swift,ben-ng/swift,LeoShimonaka/swift,milseman/swift,kentya6/swift,bitjammer/swift,roambotics/swift,kusl/swift,modocache/swift,shajrawi/swift,benlangmuir/swift,tkremenek/swift,mightydeveloper/swift,lorentey/swift,SwiftAndroid/swift,kstaring/swift,russbishop/swift,uasys/swift,stephentyrone/swift,gottesmm/swift,ahoppen/swift,xedin/swift,tinysun212/swift-windows,tardieu/swift,gribozavr/swift,Jnosh/swift,hughbe/swift,amraboelela/swift,allevato/swift,tardieu/swift,ahoppen/swift,hooman/swift,aschwaighofer/swift,cbrentharris/swift,allevato/swift,nathawes/swift,shahmishal/swift,tinysun212/swift-windows,rudkx/swift,amraboelela/swift,karwa/swift,tinysun212/swift-windows,jtbandes/swift,zisko/swift,LeoShimonaka/swift,alblue/swift,tkremenek/swift,SwiftAndroid/swift,SwiftAndroid/swift,jopamer/swift,lorentey/swift,amraboelela/swift,Ivacker/swift,frootloops/swift,deyton/swift,emilstahl/swift,gregomni/swift,swiftix/swift.old,benlangmuir/swift,stephentyrone/swift,Ivacker/swift,austinzheng/swift,jmgc/swift,harlanhaskins/swift,amraboelela/swift,practicalswift/swift,nathawes/swift,xedin/swift,MukeshKumarS/Swift,jtbandes/swift,djwbrown/swift,atrick/swift,atrick/swift,KrishMunot/swift,manavgabhawala/swift,jtbandes/swift,roambotics/swift,OscarSwanros/swift,glessard/swift,frootloops/swift,lorentey/swift,natecook1000/swift,karwa/swift,adrfer/swift,karwa/swift,calebd/swift,adrfer/swift,therealbnut/swift,swiftix/swift.old,emilstahl/swift,apple/swift,aschwaighofer/swift,brentdax/swift,jckarter/swift,MukeshKumarS/Swift,danielmartin/swift,alblue/swift,xedin/swift,natecook1000/swift,xedin/swift,harlanhaskins/swift,gmilos/swift,khizkhiz/swift,dduan/swift,lorentey/swift,OscarSwanros/swift,hooman/swift,sschiau/swift,dduan/swift,parkera/swift,aschwaighofer/swift,manavgabhawala/swift,gmilos/swift,arvedviehweger/swift,cbrentharris/swift,nathawes/swift,gottesmm/swift,arvedviehweger/swift,hooman/swift,therealbnut/swift,mightydeveloper/swift,cbrentharris/swift,johnno1962d/swift,gribozavr/swift,swiftix/swift,IngmarStein/swift,jopamer/swift,uasys/swift,OscarSwanros/swift,alblue/swift,xedin/swift,aschwaighofer/swift,uasys/swift,stephentyrone/swift,tjw/swift,Ivacker/swift,OscarSwanros/swift,adrfer/swift,xedin/swift,sschiau/swift,Jnosh/swift,roambotics/swift,cbrentharris/swift,practicalswift/swift,sdulal/swift,gottesmm/swift,modocache/swift,therealbnut/swift,modocache/swift,devincoughlin/swift,mightydeveloper/swift,milseman/swift,tkremenek/swift,swiftix/swift,LeoShimonaka/swift,tjw/swift,dduan/swift,airspeedswift/swift,shahmishal/swift,benlangmuir/swift,hughbe/swift,KrishMunot/swift,devincoughlin/swift,gottesmm/swift,KrishMunot/swift,russbishop/swift,kusl/swift,dduan/swift,stephentyrone/swift,jtbandes/swift,swiftix/swift.old,brentdax/swift,bitjammer/swift,aschwaighofer/swift,kperryua/swift,arvedviehweger/swift,practicalswift/swift,brentdax/swift,kperryua/swift,cbrentharris/swift,atrick/swift,calebd/swift,felix91gr/swift,CodaFi/swift,MukeshKumarS/Swift,slavapestov/swift,russbishop/swift,hughbe/swift,russbishop/swift,gmilos/swift,khizkhiz/swift,parkera/swift,milseman/swift,rudkx/swift,johnno1962d/swift,ken0nek/swift,mightydeveloper/swift,deyton/swift,practicalswift/swift,jmgc/swift,kperryua/swift,xwu/swift,karwa/swift,mightydeveloper/swift,Ivacker/swift,swiftix/swift,johnno1962d/swift,xedin/swift,codestergit/swift,dreamsxin/swift,calebd/swift,gribozavr/swift,austinzheng/swift,zisko/swift,parkera/swift,arvedviehweger/swift,gribozavr/swift,tkremenek/swift,alblue/swift,ben-ng/swift,return/swift,bitjammer/swift,dduan/swift,mightydeveloper/swift,JaSpa/swift,return/swift,harlanhaskins/swift,gregomni/swift,frootloops/swift,nathawes/swift,codestergit/swift,SwiftAndroid/swift,modocache/swift,ahoppen/swift,cbrentharris/swift,djwbrown/swift,devincoughlin/swift,practicalswift/swift,tjw/swift,atrick/swift,huonw/swift,xwu/swift,allevato/swift,karwa/swift,airspeedswift/swift,stephentyrone/swift,swiftix/swift.old,natecook1000/swift,kentya6/swift,devincoughlin/swift,jmgc/swift,manavgabhawala/swift,CodaFi/swift,danielmartin/swift,CodaFi/swift,stephentyrone/swift,swiftix/swift.old,Ivacker/swift,glessard/swift,shajrawi/swift,apple/swift,shahmishal/swift,benlangmuir/swift,emilstahl/swift,SwiftAndroid/swift,SwiftAndroid/swift,practicalswift/swift,hughbe/swift,LeoShimonaka/swift,ken0nek/swift