Switch away from deprecated ManagedChannelBuilder.loadBalancerFactory()

PiperOrigin-RevId: 243736311
diff --git a/src/main/java/com/google/devtools/build/lib/authandtls/GoogleAuthUtils.java b/src/main/java/com/google/devtools/build/lib/authandtls/GoogleAuthUtils.java
index 203c309..92f9f26 100644
--- a/src/main/java/com/google/devtools/build/lib/authandtls/GoogleAuthUtils.java
+++ b/src/main/java/com/google/devtools/build/lib/authandtls/GoogleAuthUtils.java
@@ -25,7 +25,6 @@
 import io.grpc.netty.GrpcSslContexts;
 import io.grpc.netty.NegotiationType;
 import io.grpc.netty.NettyChannelBuilder;
-import io.grpc.util.RoundRobinLoadBalancerFactory;
 import io.netty.handler.ssl.SslContext;
 import java.io.File;
 import java.io.FileInputStream;
@@ -59,7 +58,7 @@
       NettyChannelBuilder builder =
           NettyChannelBuilder.forTarget(targetUrl)
               .negotiationType(options.tlsEnabled ? NegotiationType.TLS : NegotiationType.PLAINTEXT)
-              .loadBalancerFactory(RoundRobinLoadBalancerFactory.getInstance())
+              .defaultLoadBalancingPolicy("round_robin")
               .intercept(interceptors);
       if (sslContext != null) {
         builder.sslContext(sslContext);