Run auto-spell-checker (codespell) on files in depot_tools.

cpplint.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2009 Google 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:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
@@ skipping 6061 matching lines @@
       global _line_length
       try:
           _line_length = int(val)
       except ValueError:
           PrintUsage('Line length must be digits.')
     elif opt == '--extensions':
       global _valid_extensions
       try:
           _valid_extensions = set(val.split(','))
       except ValueError:
-          PrintUsage('Extensions must be comma seperated list.')
+          PrintUsage('Extensions must be comma separated list.')
 
   if not filenames:
     PrintUsage('No files were specified.')
 
   _SetOutputFormat(output_format)
   _SetVerboseLevel(verbosity)
   _SetFilters(filters)
   _SetCountingStyle(counting_style)
 
   return filenames
@@ skipping 12 matching lines @@
   _cpplint_state.ResetErrorCounts()
   for filename in filenames:
     ProcessFile(filename, _cpplint_state.verbose_level)
   _cpplint_state.PrintErrorCounts()
 
   sys.exit(_cpplint_state.error_count > 0)
 
 
 if __name__ == '__main__':
   main()