Deprecated tf.Session removed in toco_from_protos_test.py

tensorflow/lite/toco/python/toco_from_protos_test.py

@@ -80,7 +80,7 @@ class TocoFromProtosTest(googletest.TestCase):
 
   def test_toco(self):
     """Run a couple of TensorFlow graphs against TOCO through the python bin."""
-    with tf.Session() as sess:
+    with tf.compat.v1.Session() as sess:
       img = tf.placeholder(name="img", dtype=tf.float32, shape=(1, 64, 64, 3))
       val = img + tf.constant([1., 2., 3.]) + tf.constant([1., 4., 4.])
       out = tf.identity(val, name="out")