Fix usage of shlex in unit tests on windows.

test/intermediate_dir/src/script.py

 #!/usr/bin/env python
 # Copyright (c) 2011 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Takes 3 arguments. Writes the 1st argument to the file in the 2nd argument,
 # and writes the absolute path to the file in the 2nd argument to the file in
 # the 3rd argument.
 
 import os
 import shlex
 import sys
 
 if len(sys.argv) == 3 and ' ' in sys.argv[2]:
-  sys.argv[2], fourth = shlex.split(sys.argv[2])
+  sys.argv[2], fourth = shlex.split(sys.argv[2].replace('\\', '\\\\'))
   sys.argv.append(fourth)
 
 #print >>sys.stderr, sys.argv
 
 with open(sys.argv[2], 'w') as f:
   f.write(sys.argv[1])
 
 with open(sys.argv[3], 'w') as f:
   f.write(os.path.abspath(sys.argv[2]))