Add variation of already-allowed license exception for NaCl.

tools/checklicenses/checklicenses.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.
 
 """Makes sure that all files contain proper licensing information."""
 
 
 import optparse
 import os.path
@@ skipping 118 matching lines @@
         'GPL (unversioned/unknown version)',
         'GPL (v2)',
 
         # TODO(phajdan.jr): Make licensecheck not print the comma after v2.
         'GPL (v2,)',
 
         'GPL (v2 or later)',
 
         # TODO(phajdan.jr): Make licensecheck not print the comma after 3.1.
         'GPL (v3.1,)',
+
+        'GPL (v3 or later)',
     ],
     'net/disk_cache/hash.cc': [  # http://crbug.com/98100
         'UNKNOWN',
     ],
     'net/tools/spdyshark': [
         'GPL (v2 or later)',
         'UNKNOWN',
     ],
 
     # http://crbug.com/98107
@@ skipping 353 matching lines @@
   option_parser.add_option('--ignore-suppressions',
                            action='store_true',
                            default=False,
                            help='Ignore path-specific license whitelist.')
   options, args = option_parser.parse_args()
   return check_licenses(options, args)
 
 
 if '__main__' == __name__:
   sys.exit(main())