message: Update keras to not use private TF API for get_json_type.
diff: @@ -32,7 +32,6 @@ import wrapt
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor_shape
  -from tensorflow.python.util import serialization
  class Encoder(json.JSONEncoder):
  @@ -42,7 +41,7 @@ class Encoder(json.JSONEncoder):
  if isinstance(obj, tensor_shape.TensorShape):
  items = obj.as_list() if obj.rank is not None else None
  return {'class_name': 'TensorShape', 'items': items}
  - return serialization.get_json_type(obj)
  + return get_json_type(obj)
  def encode(self, obj):
  return super(Encoder, self).encode(_encode_tuple(obj))
  