luci-py: Making __file__ usage unicode safe.

client/tests/isolateserver_smoke_test.py

 #!/usr/bin/env python
 # Copyright 2013 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 import hashlib
 import logging
 import os
 import shutil
 import subprocess
 import sys
 import tempfile
 import time
 import unittest
 
-ROOT_DIR = unicode(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(
+    __file__.decode(sys.getfilesystemencoding()))))
 sys.path.insert(0, ROOT_DIR)
 
 import isolated_format
 import test_utils
 from third_party.depot_tools import fix_encoding
 from utils import file_path
 
 # Ensure that the testing machine has access to this server.
 ISOLATE_SERVER = 'https://isolateserver.appspot.com/'
 
@@ skipping 96 matching lines @@
       self._archive_given_files(files)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   if len(sys.argv) > 1 and sys.argv[1].startswith('http'):
     ISOLATE_SERVER = sys.argv.pop(1).rstrip('/') + '/'
   logging.basicConfig(
       level=logging.DEBUG if '-v' in sys.argv else logging.ERROR)
   unittest.main()