Make debug flags DebugOnly
diff --git a/src/core/ext/filters/client_channel/lb_policy.h b/src/core/ext/filters/client_channel/lb_policy.h
index 00ac0b1..cd40b4d 100644
--- a/src/core/ext/filters/client_channel/lb_policy.h
+++ b/src/core/ext/filters/client_channel/lb_policy.h
@@ -33,9 +33,7 @@
typedef struct grpc_lb_policy_vtable grpc_lb_policy_vtable;
typedef struct grpc_lb_policy_args grpc_lb_policy_args;
-#ifndef NDEBUG
-extern grpc_core::TraceFlag grpc_trace_lb_policy_refcount;
-#endif
+extern grpc_core::DebugOnlyTraceFlag grpc_trace_lb_policy_refcount;
struct grpc_lb_policy {
const grpc_lb_policy_vtable* vtable;