message: Fix the compilation problem of S3 test cases
diff: @@ -69,7 +69,7 @@ class S3FileSystemTest : public ::testing::Test {
  std::unique_ptr<RandomAccessFile> reader;
  TF_RETURN_IF_ERROR(
  - s3fs.NewRandomAccessFile(fname, &reader, use_multi_part_download));
  + s3fs.NewRandomAccessFile(fname, nullptr, &reader, use_multi_part_download));
  uint64 file_size = 0;
  TF_RETURN_IF_ERROR(s3fs.GetFileSize(fname, &file_size));
  @@ -228,13 +228,13 @@ TEST_F(S3FileSystemTest, FileExists) {
  TEST_F(S3FileSystemTest, GetChildren) {
  const string base = TmpDir("GetChildren");
  - TF_EXPECT_OK(s3fs.CreateDir(base));
  + TF_EXPECT_OK(s3fs.CreateDir(base, nullptr));
  const string file = io::JoinPath(base, "TestFile.csv");
  TF_EXPECT_OK(WriteString(file, "test"));
  const string subdir = io::JoinPath(base, "SubDir");
  - TF_EXPECT_OK(s3fs.CreateDir(subdir));
  + TF_EXPECT_OK(s3fs.CreateDir(subdir, nullptr));
  // s3 object storage doesn't support empty directory, we create file in the
  // directory
  const string subfile = io::JoinPath(subdir, "TestSubFile.csv");
  @@ -264,7 +264,7 @@ TEST_F(S3FileSystemTest, CreateDir) {
  // s3 object storage doesn't support empty directory, we create file in the
  // directory
  const string dir = TmpDir("CreateDir");
  - TF_EXPECT_OK(s3fs.CreateDir(dir));
  + TF_EXPECT_OK(s3fs.CreateDir(dir, nullptr));
  const string file = io::JoinPath(dir, "CreateDirFile.csv");
  TF_EXPECT_OK(WriteString(file, "test"));
  