message: Remove max_message_size arg, which is not passed to Deserialize func.
diff: @@ -43,9 +43,7 @@ class SerializationTraits<T, typename std::enable_if<std::is_base_of<
  // There is no de-serialization step in FlatBuffers, so we just receive
  // the data from GRPC.
  - static grpc::Status Deserialize(grpc_byte_buffer *buffer,
  - T *msg,
  - int max_message_size) {
  + static grpc::Status Deserialize(grpc_byte_buffer *buffer, T *msg) {
  // TODO(wvo): make this more efficient / zero copy when possible.
  auto len = grpc_byte_buffer_length(buffer);
  msg->buf = reinterpret_cast<uint8_t *>(malloc(len));
  