Internal change

PiperOrigin-RevId: 303770259
Change-Id: I2828092f445bfd5d465f43d40dc19d7bdc05386d
diff --git a/src/pb/observation_batch.proto b/src/pb/observation_batch.proto
index 5488dae..212de38 100644
--- a/src/pb/observation_batch.proto
+++ b/src/pb/observation_batch.proto
@@ -7,8 +7,6 @@
 
 option go_package = "cobalt";
 
-option go_api_flag = "OPEN_TO_OPAQUE_HYBRID";
-
 ////////////////////////////////////////////////////////////////////////////////
 //
 // NOTE: The observation_batch.proto is used by the Cobalt client and the Cobalt