message: remove dependency on feature_column_lib.DenseFeatures
diff: @@ -33,6 +33,7 @@ from tensorflow.python.keras import combinations
  from tensorflow.python.keras import losses
  from tensorflow.python.keras import testing_utils
  from tensorflow.python.keras.engine import sequential
  +from tensorflow.python.keras.feature_column import dense_features
  from tensorflow.python.keras.layers import core
  from tensorflow.python.keras.saving import model_config
  from tensorflow.python.keras.saving import save
  @@ -151,7 +152,7 @@ class TestSaveModel(test.TestCase, parameterized.TestCase):
  'b': keras.layers.Input(shape=(1,), name='b', dtype='string')
  }
  - fc_layer = feature_column_lib.DenseFeatures(cols)(input_layers)
  + fc_layer = dense_features.DenseFeatures(cols)(input_layers)
  output = keras.layers.Dense(10)(fc_layer)
  model = keras.models.Model(input_layers, output)
  