Delete obsolete import. (#31010)
Delete obsolete import. (#31010)


stanley-cheung/grpc,stanley-cheung/grpc,stanley-cheung/grpc,jtattermusch/grpc,stanley-cheung/grpc,jtattermusch/grpc,grpc/grpc,stanley-cheung/grpc,jtattermusch/grpc,stanley-cheung/grpc,stanley-cheung/grpc,grpc/grpc,grpc/grpc,grpc/grpc,jtattermusch/grpc,grpc/grpc,stanley-cheung/grpc,stanley-cheung/grpc,grpc/grpc,jtattermusch/grpc,jtattermusch/grpc,grpc/grpc,jtattermusch/grpc,grpc/grpc,stanley-cheung/grpc,grpc/grpc,grpc/grpc,jtattermusch/grpc,jtattermusch/grpc,jtattermusch/grpc,stanley-cheung/grpc,grpc/grpc,jtattermusch/grpc,stanley-cheung/grpc,jtattermusch/grpc,grpc/grpc