Removed grpc_error_std_string (#31347)

src/core/lib/iomgr/error.cc

@@ -54,10 +54,6 @@ absl::Status grpc_status_create(absl::StatusCode code, absl::string_view msg,
   return s;
 }
 
-std::string grpc_error_std_string(absl::Status error) {
-  return grpc_core::StatusToString(error);
-}
-
 absl::Status grpc_os_error(const grpc_core::DebugLocation& location, int err,
                            const char* call_name) {
   auto err_string = grpc_core::StrError(err);

src/core/lib/iomgr/error.h

@@ -42,10 +42,6 @@
 
 typedef absl::Status grpc_error_handle;
 
-// DEPRECATED: Use grpc_core::StatusToString instead
-// TODO(veblush): Remove this once migration is done
-std::string grpc_error_std_string(grpc_error_handle error);
-
 #define GRPC_ERROR_CREATE(desc) \
   StatusCreate(absl::StatusCode::kUnknown, desc, DEBUG_LOCATION, {})