Use underscores to separate words in filenames in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 968 matching lines @@
         suffixes = set()
         if IMAGE in expectations:
             suffixes.add('png')
         if FAIL in expectations:
             suffixes.add('txt')
             suffixes.add('png')
             suffixes.add('wav')
         return set(suffixes)
 
     @staticmethod
-    # test_result is an instance of webkitpy.common.net.layouttestresults.LayoutTestResult
+    # test_result is an instance of webkitpy.common.net.layout_test_results.LayoutTestResult
     def suffixes_for_test_result(test_result):
         suffixes = set()
         actual_results = test_result.actual_results()
         if 'TEXT' in actual_results:
             suffixes.add('txt')
         if 'IMAGE' in actual_results:
             suffixes.add('png')
         if 'AUDIO' in actual_results:
             suffixes.add('wav')
         if 'MISSING' in actual_results:
@@ skipping 206 matching lines @@
             # If reconstitute_only_these is an empty list, we want to return original_string.
             # So we need to compare reconstitute_only_these to None, not just check if it's falsey.
             if reconstitute_only_these is None or expectation_line in reconstitute_only_these:
                 return expectation_line.to_string(test_configuration_converter)
             return expectation_line.original_string
 
         def nones_out(expectation_line):
             return expectation_line is not None
 
         return '\n'.join(filter(nones_out, map(serialize, expectation_lines)))