message: Address comments in irfft2d_test
diff: -/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
  +/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  @@ -29,11 +29,8 @@ namespace tflite {
  namespace ops {
  namespace custom {
  -TfLiteRegistration* Register_IRFFT2D();
  -
  namespace {
  -using std::complex;
  using ::testing::ElementsAreArray;
  class Irfft2dOpModel : public SingleOpModel {
  