cleanup: remove unused symbols (#2581)

clientconn.go

@@ -926,9 +926,8 @@ type addrConn struct {
 	backoffIdx   int // Needs to be stateful for resetConnectBackoff.
 	resetBackoff chan struct{}
 
-	channelzID         int64 // channelz unique identification number.
-	czData             *channelzData
-	healthCheckEnabled bool
+	channelzID int64 // channelz unique identification number.
+	czData     *channelzData
 }
 
 // Note: this requires a lock on ac.mu.

credentials/alts/internal/conn/aes128gcmrekey_test.go

@@ -24,11 +24,6 @@ import (
 	core "google.golang.org/grpc/credentials/alts/internal"
 )
 
-// cryptoTestVector is struct for a rekey test vector
-type rekeyTestVector struct {
-	key, nonce, plaintext, ciphertext []byte
-}
-
 // getGCMCryptoPair outputs a client/server pair on aes128gcmRekey.
 func getRekeyCryptoPair(key []byte, counter []byte, t *testing.T) (ALTSRecordCrypto, ALTSRecordCrypto) {
 	client, err := NewAES128GCMRekey(core.ClientSide, key)

credentials/alts/internal/handshaker/handshaker_test.go

@@ -31,7 +31,6 @@ import (
 )
 
 var (
-	testAppProtocols   = []string{"grpc"}
 	testRecordProtocol = rekeyRecordProtocolName
 	testKey            = []byte{
 		// 44 arbitrary bytes.

credentials/alts/internal/handshaker/service/service.go

@@ -34,8 +34,6 @@ var (
 	hsDialer = grpc.Dial
 )
 
-type dialer func(target string, opts ...grpc.DialOption) (*grpc.ClientConn, error)
-
 // Dial dials the handshake service in the hypervisor. If a connection has
 // already been established, this function returns it. Otherwise, a new
 // connection is created.

examples/features/metadata/server/main.go

@@ -40,7 +40,6 @@ var port = flag.Int("port", 50051, "the port to serve on")
 
 const (
 	timestampFormat = time.StampNano
-	smallDuration   = time.Second
 	streamingCount  = 10
 )
 

examples/features/name_resolving/server/main.go

@@ -50,9 +50,6 @@ func (s *ecServer) BidirectionalStreamingEcho(ecpb.Echo_BidirectionalStreamingEc
 	return status.Errorf(codes.Unimplemented, "not implemented")
 }
 
-func startServer(addr string) {
-}
-
 func main() {
 	lis, err := net.Listen("tcp", addr)
 	if err != nil {

stream.go

@@ -1086,7 +1086,6 @@ type addrConnStream struct {
 	dc        Decompressor
 	decomp    encoding.Compressor
 	p         *parser
-	done      func(balancer.DoneInfo)
 	mu        sync.Mutex
 	finished  bool
 }