Use underscores to separate words in filenames in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/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
 import unittest
 
 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, MockExecutive2
-from webkitpy.common.system.outputcapture import OutputCapture
+from webkitpy.common.system.output_capture import OutputCapture
 from webkitpy.layout_tests.builder_list import BuilderList
 from webkitpy.tool.commands.rebaseline import (
     AbstractParallelRebaselineCommand, CopyExistingBaselinesInternal,
     Rebaseline, RebaselineExpectations, RebaselineJson, RebaselineTest
 )
 from webkitpy.tool.mock_tool import MockWebKitPatch
 
 
 # pylint: disable=protected-access
 class BaseTestCase(unittest.TestCase):
@@ skipping 904 matching lines @@
         for cmd_line, cwd in commands:
             out = self.run_command(cmd_line, cwd=cwd)
             if 'rebaseline-test-internal' in cmd_line:
                 out = '{"remove-lines": [{"test": "%s", "builder": "%s"}]}\n' % (cmd_line[8], cmd_line[6])
             command_outputs.append([0, out, ''])
 
         new_calls = self.calls[num_previous_calls:]
         self.calls = self.calls[:num_previous_calls]
         self.calls.append(new_calls)
         return command_outputs