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

gcl.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """\
 Wrapper script around Rietveld's upload.py that simplifies working with groups
 of files.
 """
 
@@ skipping 602 matching lines @@
   """Returns the file that stores information about a changelist."""
   if not changename or re.search(r'[^\w-]', changename):
     ErrorExit("Invalid changelist name: " + changename)
   return os.path.join(GetChangesDir(), changename)
 
 
 def LoadChangelistInfoForMultiple(changenames, local_root, fail_on_not_found,
                                   update_status):
   """Loads many changes and merge their files list into one pseudo change.
 
-  This is mainly usefull to concatenate many changes into one for a 'gcl try'.
+  This is mainly useful to concatenate many changes into one for a 'gcl try'.
   """
   changes = changenames.split(',')
   aggregate_change_info = ChangeInfo(
       changenames, 0, 0, '', None, local_root, None, False)
   for change in changes:
     aggregate_change_info._files += ChangeInfo.Load(
         change, local_root, fail_on_not_found, update_status).GetFiles()
   return aggregate_change_info
 
 
@@ skipping 880 matching lines @@
     return 1
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)