message: Change inherited classes for FixedLengthRecordDataset and TextLineDataset
diff: @@ -32,7 +32,7 @@ _DEFAULT_READER_BUFFER_SIZE_BYTES = 256 * 1024 # 256 KB
  @tf_export("data.TextLineDataset")
  -class TextLineDataset(dataset_ops.Dataset):
  +class TextLineDataset(dataset_ops.DatasetSource):
  """A `Dataset` comprising lines from one or more text files."""
  def __init__(self, filenames, compression_type=None, buffer_size=None):
  @@ -61,9 +61,6 @@ class TextLineDataset(dataset_ops.Dataset):
  return gen_dataset_ops.text_line_dataset(
  self._filenames, self._compression_type, self._buffer_size)
  - def _inputs(self):
  - return []
  -
  @property
  def output_classes(self):
  return ops.Tensor
  @@ -247,7 +244,7 @@ class TFRecordDataset(dataset_ops.Dataset):
  @tf_export("data.FixedLengthRecordDataset")
  -class FixedLengthRecordDataset(dataset_ops.Dataset):
  +class FixedLengthRecordDataset(dataset_ops.DatasetSource):
  """A `Dataset` of fixed-length records from one or more binary files."""
  def __init__(self,
  @@ -287,9 +284,6 @@ class FixedLengthRecordDataset(dataset_ops.Dataset):
  self._filenames, self._header_bytes, self._record_bytes,
  self._footer_bytes, self._buffer_size)
  - def _inputs(self):
  - return []
  -
  @property
  def output_classes(self):
  return ops.Tensor
  