message: Fix a pybind11 + absl string view compatibility error.
diff: @@ -33,8 +33,7 @@ PYBIND11_MODULE(_pywrap_events_writer, m) {
  .def("FileName",
  [](tensorflow::EventsWriter& self) { return self.FileName(); })
  .def("_WriteSerializedEvent",
  - [](tensorflow::EventsWriter& self,
  - const absl::string_view event_str) {
  + [](tensorflow::EventsWriter& self, const std::string& event_str) {
  self.WriteSerializedEvent(event_str);
  })
  .def("Flush", [](tensorflow::EventsWriter& self) { return self.Flush(); })
  