Clean up webkitpy.common.checkout.git module.

third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/git_unittest.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/git_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/git_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/git_unittest.py
index 07f48959df8842fcade12bba01686c393df6e93c..87ce53cbb24a8c93acdfd29aad34662202fa09d8 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/git_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/git_unittest.py
@@ -198,8 +198,7 @@ class GitTestWithMock(unittest.TestCase):
     def _assert_timestamp_of_revision(self, canned_git_output, expected):
         git = self.make_git()
         git.find_checkout_root = lambda path: ''
-        # Modifying protected method. pylint: disable=protected-access
-        git._run_git = lambda args: canned_git_output
+        git.run = lambda args: canned_git_output
         self.assertEqual(git.timestamp_of_revision('some-path', '12345'), expected)
 
     def test_timestamp_of_revision_utc(self):
@@ -222,8 +221,7 @@ class GitTestWithMock(unittest.TestCase):
             'M  d/modified-staged.txt',
             'A  d/added-staged.txt',
         ]
-        # pylint: disable=protected-access
-        git._run_git = lambda args: '\x00'.join(status_lines) + '\x00'
+        git.run = lambda args: '\x00'.join(status_lines) + '\x00'
         self.assertEqual(
             git.unstaged_changes(),
             {