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

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

 # Copyright (C) 2010 Apple 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:
 # 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 10 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 """Checks WebKit style for XML files."""
 
 from __future__ import absolute_import
 
 from xml.parsers import expat
 
 
 class XMLChecker(object):
+
     """Processes XML lines for checking style."""
 
     def __init__(self, file_path, handle_style_error):
         self._handle_style_error = handle_style_error
         self._handle_style_error.turn_off_line_filtering()
 
     def check(self, lines):
         parser = expat.ParserCreate()
         try:
             for line in lines:
                 parser.Parse(line)
                 parser.Parse('\n')
             parser.Parse('', True)
-        except expat.ExpatError, error:
+        except expat.ExpatError as error:
             self._handle_style_error(error.lineno, 'xml/syntax', 5, expat.ErrorString(error.code))