Use underscores to separate words in filenames in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/common/net/rietveld_unittest.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import urllib2
 
 from webkitpy.common.net.rietveld import Rietveld
 from webkitpy.common.net.buildbot import Build
 from webkitpy.common.net.web_mock import MockWeb
-from webkitpy.common.system.logtesting import LoggingTestCase
+from webkitpy.common.system.log_testing import LoggingTestCase
 
 
 class RietveldTest(LoggingTestCase):
 
     def mock_web(self):
         return MockWeb(urls={
             'https://codereview.chromium.org/api/11112222': json.dumps({
                 'patchsets': [1, 2, 3],
             }),
             'https://codereview.chromium.org/api/11112222/2': json.dumps({
@@ skipping 88 matching lines @@
         rietveld = Rietveld(self.mock_web())
         self.assertEqual(
             rietveld._filter_latest_builds([Build('foo', 3), Build('bar', 5), Build('foo', 5)]),
             [Build('bar', 5), Build('foo', 5)])
 
     def test_filter_latest_jobs_no_build_number(self):
         rietveld = Rietveld(self.mock_web())
         self.assertEqual(
             rietveld._filter_latest_builds([Build('foo', 3), Build('bar'), Build('bar')]),
             [Build('bar'), Build('foo', 3)])