Prevent construction of container classes and reduce API
diff --git a/compiler/src/test/golden/TestService.java.txt b/compiler/src/test/golden/TestService.java.txt
index 7f5f4d4..66021a7 100644
--- a/compiler/src/test/golden/TestService.java.txt
+++ b/compiler/src/test/golden/TestService.java.txt
@@ -16,6 +16,8 @@
 @javax.annotation.Generated("by gRPC proto compiler")
 public class TestServiceGrpc {
 
+  private TestServiceGrpc() {}
+
   public static final String SERVICE_NAME = "grpc.testing.TestService";
 
   // Static method descriptors that strictly reflect the proto.