luci-py: Making __file__ usage unicode safe.

client/tests/isolate_test.py

 #!/usr/bin/env python
 # Copyright 2012 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 cStringIO
 import hashlib
 import json
 import logging
 import optparse
 import os
 import shutil
 import subprocess
 import sys
 import tempfile
 
-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)
 sys.path.insert(0, os.path.join(ROOT_DIR, 'third_party'))
 
 from depot_tools import auto_stub
 from depot_tools import fix_encoding
 import auth
 import isolate
 import isolate_format
 import isolated_format
 import isolateserver
@@ skipping 1590 matching lines @@
 
 def clear_env_vars():
   for e in ('ISOLATE_DEBUG', 'ISOLATE_SERVER'):
     os.environ.pop(e, None)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   clear_env_vars()
   test_utils.main()