Add psutil build step to fix pyauto media issues. Upgrade psutil to 0.4.0.

third_party/psutil/psutil/_psposix.py

Index: third_party/psutil/psutil/_psposix.py
diff --git a/third_party/psutil/psutil/_psposix.py b/third_party/psutil/psutil/_psposix.py
index 08cc268f659f90f811989ea4ce69da0fd2493d09..5fece5c54c3431319368bcbadc848a5a3b77e1eb 100644
--- a/third_party/psutil/psutil/_psposix.py
+++ b/third_party/psutil/psutil/_psposix.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# $Id: _psposix.py 1142 2011-10-05 18:45:49Z g.rodola $
+# $Id: _psposix.py 1162 2011-10-14 20:41:07Z g.rodola $
 #
 # Copyright (c) 2009, Jay Loden, Giampaolo Rodola'. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -128,6 +128,7 @@ class LsofParser:
         self.pid = pid
         self.process_name = name
 
+    # XXX - this is no longer used
     def get_process_open_files(self):
         """Return files opened by process by parsing lsof output."""
         # Options: