Port xxd.pl to xxd.py (Perl to Python)

Source/build/ConvertFileToHeaderWithCharacterArray.gypi

 #
 # Copyright (C) 2013 Igalia S.L.
 #
 # 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.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 #     'output_file_path': '<(SHARED_INTERMEDIATE_DIR)/blink/InjectedScriptSource.h',
 #     'character_array_name': 'InjectedScriptSource_js',
 #   },
 #   'includes': [ 'ConvertFileToHeaderWithCharacterArray.gypi' ],
 # },
 {
   'actions': [
     {
       'action_name': 'ConvertFileToHeaderWithCharacterArray',
       'inputs': [
-        '../build/scripts/xxd.pl',
+        '../build/scripts/xxd.py',
         '<(input_file_path)',
       ],
       'outputs': [ '<@(output_file_path)', ],
       'action': [
-        '<(perl_exe)',
-        '../build/scripts/xxd.pl',
+        'python',
+        '../build/scripts/xxd.py',
         '<(character_array_name)',
         '<(input_file_path)',
         '<@(_outputs)'
       ],
       'message': 'Generating <(output_file_path) from <(input_file_path)',
+      'msvs_cygwin_shell': 0,
     },
   ],
 
   # Since this target generates header files, it needs to be a hard dependency.
   'hard_dependency': 1,
 }