message: Make the text summary write no plugin data content
  This is actually a safe removal because no logic makes use of the content of text plugin data.
diff: @@ -23,7 +23,6 @@ from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  -from collections import namedtuple
  import json
  from tensorflow.core.framework import summary_pb2
  @@ -33,9 +32,6 @@ from tensorflow.python.summary import plugin_asset
  PLUGIN_NAME = "text"
  -# Contains event-related data specific to the text plugin.
  -_TextPluginData = namedtuple("_TextPluginData", [])
  -
  def text_summary(name, tensor, collections=None):
  """Summarizes textual data.
  @@ -67,11 +63,9 @@ def text_summary(name, tensor, collections=None):
  raise ValueError("Expected tensor %s to have dtype string, got %s" %
  (tensor.name, tensor.dtype))
  - summary_metadata = summary_pb2.SummaryMetadata()
  - text_plugin_data = _TextPluginData()
  - data_dict = text_plugin_data._asdict() # pylint: disable=protected-access
  - summary_metadata.plugin_data.plugin_name = PLUGIN_NAME
  - summary_metadata.plugin_data.content = json.dumps(data_dict)
  + summary_metadata = summary_pb2.SummaryMetadata(
  + plugin_data=summary_pb2.SummaryMetadata.PluginData(
  + plugin_name=PLUGIN_NAME))
  t_summary = tensor_summary(
  name=name,
  tensor=tensor,
  