Remove all unused variables.

third_party/WebKit/Tools/Scripts/webkitpy/style/filereader.py

 # Copyright (C) 2009 Google Inc. All rights reserved.
 # Copyright (C) 2010 Chris Jerdonek (chris.jerdonek@gmail.com)
 # Copyright (C) 2010 ProFUSION embedded systems
 #
 # 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.
@@ skipping 114 matching lines @@
         except IOError as err:
             message = ("Could not read file. Skipping: '%s'\n  %s" % (file_path, err))
             _log.warn(message)
             return
 
         self._processor.process(lines, file_path, **kwargs)
 
     def _process_directory(self, directory):
         """Process all files in the given directory, recursively."""
         # FIXME: We should consider moving to self.filesystem.files_under() (or adding walk() to FileSystem)
-        for dir_path, dir_names, file_names in os.walk(directory):
+        for dir_path, _, file_names in os.walk(directory):
             for file_name in file_names:
                 file_path = self.filesystem.join(dir_path, file_name)
                 self.process_file(file_path)
 
     def process_paths(self, paths):
         for path in paths:
             if self.filesystem.isdir(path):
                 self._process_directory(directory=path)
             else:
                 self.process_file(path)
 
     def count_delete_only_file(self):
         """Count up files that contains only deleted lines.
 
         Files which has no modified or newly-added lines don't need
         to check style, but should be treated as checked. For that
         purpose, we just count up the number of such files.
         """
         self.delete_only_file_count += 1