Remove non-logging usages Status::ToString and hence the string representation of error codes

PiperOrigin-RevId: 390508453
Change-Id: Ic53772731da5e3c0ba6d1f9469d039aee4bdd941
diff --git a/tensorflow/core/distributed_runtime/graph_mgr.cc b/tensorflow/core/distributed_runtime/graph_mgr.cc
index 889bf4e..b0b3d39 100644
--- a/tensorflow/core/distributed_runtime/graph_mgr.cc
+++ b/tensorflow/core/distributed_runtime/graph_mgr.cc
@@ -376,7 +376,7 @@
     // Failing to fetch the outputs should not be possible, so rewrite the error
     // status to an INTERNAL error.
     s = errors::Internal("Failed to fetch outputs for step ", step_id,
-                         ". (Original error message: ", s.ToString(), ")");
+                         ". (Original error message: ", s.error_message(), ")");
   }
   size_t output_size = 0;
   for (auto& p : *out) {
diff --git a/tensorflow/core/distributed_runtime/rpc/grpc_worker_service_impl.h b/tensorflow/core/distributed_runtime/rpc/grpc_worker_service_impl.h
index 00434b3..68fbe3a 100644
--- a/tensorflow/core/distributed_runtime/rpc/grpc_worker_service_impl.h
+++ b/tensorflow/core/distributed_runtime/rpc/grpc_worker_service_impl.h
@@ -56,7 +56,7 @@
       if (!s.ok()) {
         result = Status(StatusCode::INTERNAL,
                         ::tensorflow::strings::StrCat(
-                            "TensorResponse parse error", s.ToString()));
+                            "TensorResponse parse error", s.error_message()));
       }
     }
     buffer->Clear();