Use underscores to separate words in filenames in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/auto_rebaseline_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 optparse
 
 from webkitpy.common.net.buildbot import Build
-from webkitpy.common.net.layouttestresults import LayoutTestResults
+from webkitpy.common.net.layout_test_results import LayoutTestResults
 from webkitpy.common.system.executive_mock import MockExecutive
 from webkitpy.layout_tests.builder_list import BuilderList
 from webkitpy.tool.commands.auto_rebaseline import AutoRebaseline
 from webkitpy.tool.commands.rebaseline_unittest import BaseTestCase
 from webkitpy.tool.commands.rebaseline_unittest import MockLineRemovingExecutive
 
 
 class TestAutoRebaseline(BaseTestCase):
     command_constructor = AutoRebaseline
 
@@ skipping 501 matching lines @@
 
     def test_execute_with_dry_run(self):
         self._basic_execute_test([], dry_run=True)
         self.assertEqual(self.tool.scm().local_commits(), [])
 
     def test_bot_revision_data(self):
         self._setup_mock_build_data()
         self.assertEqual(
             self.command.bot_revision_data(self.tool.scm()),
             [{'builder': 'MOCK Win7', 'revision': '9000'}])