Remove all unused variables.

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

 # Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
 #
 # 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 45 matching lines @@
             #        This will require updating the error handler __call__
             #        signature to include an optional "offset" parameter.
             pep8_code = text[:4]
             pep8_message = text[5:]
 
             category = "pep8/" + pep8_code
 
             self._handle_style_error(line_number, category, 5, pep8_message)
 
         pep8_checker.report_error = _pep8_handle_error
-        pep8_errors = pep8_checker.check_all()
+        pep8_checker.check_all()
 
     def _check_pylint(self):
         output = self.run_pylint(self._file_path)
         errors = self._parse_pylint_output(output)
         for line_number, category, message in errors:
             self._handle_style_error(line_number, category, 5, message)
 
     def run_pylint(self, path):
         wkf = WebKitFinder(FileSystem())
         executive = Executive()
@@ skipping 36 matching lines @@
 
             line_number = int(match_obj.group(2))
             category_and_method = match_obj.group(3).split(', ')
             category = 'pylint/' + (category_and_method[0])
             if len(category_and_method) > 1:
                 message = '[%s] %s' % (category_and_method[1], match_obj.group(4))
             else:
                 message = match_obj.group(4)
             errors.append((line_number, category, message))
         return errors