Run format-webkit on webkitpy code (without string conversion).

third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/png_unittest.py

 # Copyright (C) 2012 Balazs Ankes (bank@inf.u-szeged.hu) University of Szeged
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1.  Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 # 2.  Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
@@ skipping 13 matching lines @@
 """Unit test for png.py."""
 
 import unittest
 
 from png import PNGChecker
 from webkitpy.common.system.filesystem_mock import MockFileSystem
 from webkitpy.common.system.systemhost_mock import MockSystemHost
 
 
 class PNGCheckerTest(unittest.TestCase):
+
     """Tests PNGChecker class."""
 
     def test_init(self):
         """Test __init__() method."""
 
         def mock_handle_style_error(self):
             pass
 
         checker = PNGChecker("test/config", mock_handle_style_error, MockSystemHost())
         self.assertEqual(checker._file_path, "test/config")
@@ skipping 16 matching lines @@
         self.assertEqual(len(errors), 0)
 
         file_path = "foo-expected.png"
         fs.write_binary_file(file_path, "Dummy binary data")
         errors = []
         checker = PNGChecker(file_path, mock_handle_style_error, MockSystemHost(os_name='linux', filesystem=fs))
         checker.check()
         self.assertEqual(len(errors), 1)
         self.assertEqual(errors[0], (0, 'image/png', 5,
                                      'Image lacks a checksum. Generate pngs using run-webkit-tests to ensure they have a checksum.'))