IDL compiler: delete Perl compiler, remove unstable/ directory

Source/bindings/scripts/blink_idl_parser.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 @@
 # pylint: disable=C0301
 #
 # Disable attribute validation, as lint can't import parent class to check
 # pylint: disable=E1101
 
 import os.path
 import sys
 
 # PLY is in Chromium src/third_party/ply
 module_path, module_name = os.path.split(__file__)
-third_party = os.path.join(module_path, os.pardir, os.pardir, os.pardir, os.pardir, os.pardir)
+third_party = os.path.join(module_path, os.pardir, os.pardir, os.pardir, os.pardir)
 # Insert at front to override system libraries, and after path[0] == script dir
 sys.path.insert(1, third_party)
 from ply import yacc
 
 # Base parser is in Chromium src/tools/idl_parser
-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_parser import IDLParser, ListFromConcat
 from idl_parser.idl_parser import ParseFile as parse_file
 
 from blink_idl_lexer import BlinkIDLLexer
 
 
 # Explicitly set starting symbol to rule defined only in base parser.
 # BEWARE that the starting symbol should NOT be defined in both the base parser
 # and the derived one, as otherwise which is used depends on which line number
@@ skipping 340 matching lines @@
         self._parse_errors = 0
         self._parse_warnings = 0
         self._last_error_msg = None
         self._last_error_lineno = 0
         self._last_error_pos = 0
 
 
 # If run by itself, attempt to build the parser
 if __name__ == '__main__':
     parser = BlinkIDLParser()