Fix Travis lint errors.

Seen in https://travis-ci.org/github/google/pytype/jobs/743080653. PiperOrigin-RevId: 341954573
google · Nov 12, 2020 · 79b728d · 79b728d
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commit 79b728d
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diff --git a/pytype/pytd/visitors_test.py b/pytype/pytd/visitors_test.py
@@ -1,5 +1,4 @@
 import textwrap
-import unittest
 
 from pytype.pytd import escape
 from pytype.pytd import pytd

diff --git a/pytype/tests/test_errors.py b/pytype/tests/test_errors.py
@@ -1,7 +1,6 @@
 """Tests for displaying errors."""
 
 from pytype import file_utils
-from pytype.pytd import escape
 from pytype.tests import test_base