luci-py: Making __file__ usage unicode safe.

client/tests/trace_inputs_test.py

Index: client/tests/trace_inputs_test.py
diff --git a/client/tests/trace_inputs_test.py b/client/tests/trace_inputs_test.py
index 7b1c8e54c03269b3ca2f30979679458bc383a6cd..5313de3ac59b3b3542c3c27c44cc26ae720cedd7 100755
--- a/client/tests/trace_inputs_test.py
+++ b/client/tests/trace_inputs_test.py
@@ -10,11 +10,12 @@ import os
 import sys
 import unittest
 
-BASE_DIR = unicode(os.path.dirname(os.path.abspath(__file__)))
+BASE_DIR = os.path.dirname(os.path.abspath(
+    __file__.decode(sys.getfilesystemencoding())))
 ROOT_DIR = os.path.dirname(BASE_DIR)
 sys.path.insert(0, ROOT_DIR)
 
-FILE_PATH = unicode(os.path.abspath(__file__))
+FILE_PATH = os.path.abspath(__file__.decode(sys.getfilesystemencoding()))
 
 import trace_inputs
 
@@ -237,7 +238,8 @@ if sys.platform != 'win32':
             '|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f5350f829d0) = %d' %
             self._GRAND_CHILD_PID),
         (self._GRAND_CHILD_PID,
-          'open("%s", O_RDONLY)       = 76' % os.path.basename(str(FILE_PATH))),
+          'open("%s", O_RDONLY)       = 76' % os.path.basename(
+              FILE_PATH.encode('utf-8'))),
       ]
       size = os.stat(FILE_PATH).st_size
       expected = {