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

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

 # Copyright (C) 2011 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 20 matching lines @@
 
     categories = set(('json/syntax',))
 
     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):
         try:
             json.loads('\n'.join(lines) + '\n')
-        except ValueError, e:
+        except ValueError as e:
             self._handle_style_error(self.line_number_from_json_exception(e), 'json/syntax', 5, str(e))
 
     @staticmethod
     def line_number_from_json_exception(error):
         match = re.search(r': line (?P<line>\d+) column \d+', str(error))
         if not match:
             return 0
         return int(match.group('line'))