IDL compiler: delete Perl compiler, remove unstable/ directory

Source/bindings/scripts/blink_idl_lexer.py

 # Copyright (C) 2013 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.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 38 matching lines @@
 """
 
 # Disable attribute validation, as lint can't import parent class to check
 # pylint: disable=E1101
 
 import os.path
 import sys
 
 # Base lexer is in Chromium src/tools/idl_parser
 module_path, module_name = os.path.split(__file__)
-tools_dir = os.path.join(module_path, os.pardir, os.pardir, os.pardir, os.pardir, os.pardir, os.pardir, 'tools')
+tools_dir = os.path.join(module_path, os.pardir, os.pardir, os.pardir, os.pardir, os.pardir, 'tools')
 sys.path.append(tools_dir)
 
 from idl_parser.idl_lexer import IDLLexer
 
 REMOVE_TOKENS = ['COMMENT']
 
 
 class BlinkIDLLexer(IDLLexer):
     # ignore comments
     def t_COMMENT(self, t):
@@ skipping 11 matching lines @@
             self._RemoveToken(token)
 
     def __init__(self):
         IDLLexer.__init__(self)
         self._RemoveTokens(REMOVE_TOKENS)
 
 
 # If run by itself, attempt to build the lexer
 if __name__ == '__main__':
     lexer = BlinkIDLLexer()