[rebranch] Add missing string include
[rebranch] Add missing string include

benlangmuir/swift,glessard/swift,glessard/swift,glessard/swift,glessard/swift,apple/swift,apple/swift,benlangmuir/swift,roambotics/swift,benlangmuir/swift,glessard/swift,roambotics/swift,benlangmuir/swift,roambotics/swift,benlangmuir/swift,glessard/swift,roambotics/swift,apple/swift,apple/swift,benlangmuir/swift,roambotics/swift,roambotics/swift,apple/swift,apple/swift