luci-py: Making __file__ usage unicode safe.

client/third_party/infra_libs/event_mon/checkouts.py

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Functions in this file relies on depot_tools been checked-out as a sibling
 # of infra.git.
 
 import logging
 import os
 import re
 import subprocess
 
 
 BASE_DIR = os.path.dirname(
   os.path.dirname(
     os.path.dirname(
-      os.path.dirname(os.path.realpath(__file__)))))
+      os.path.dirname(os.path.realpath(
+        __file__.decode(sys.getfilesystemencoding()))))))
 
 
 def parse_revinfo(revinfo):
   """Parse the output of "gclient revinfo -a"
 
   Args:
     revinfo (str): string containing gclient stdout.
 
   Returns:
     revinfo_d (dict): <directory>: (URL, revision)
@@ skipping 36 matching lines @@
   """
 
   cmd = [os.path.join(BASE_DIR, 'depot_tools', 'gclient'), 'revinfo', '-a']
   logging.debug('Running: %s', ' '.join(cmd))
   revinfo = ''
   try:
     revinfo = subprocess.check_output(cmd, cwd=cwd)
   except (subprocess.CalledProcessError, OSError):
     logging.exception('Command failed to run: %s', ' '.join(cmd))
   return parse_revinfo(revinfo)