Fix python scripts in src/tools/

tools/net/netlog.py

Index: tools/net/netlog.py
diff --git a/tools/net/netlog.py b/tools/net/netlog.py
index 610052bbbd70045b1fdd1b03f717bb62c9f0ce31..f66d5f04afc897b97502076d17b2397b14c5e66f 100755
--- a/tools/net/netlog.py
+++ b/tools/net/netlog.py
@@ -1,5 +1,5 @@
-#!/usr/bin/python
-# Copyright (c) 2010 The Chromium Authors. All rights reserved.
+#!/usr/bin/env python
+# Copyright (c) 2011 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.
 
@@ -172,6 +172,4 @@ def main(_):
 
 
 if '__main__' == __name__:
-  ret = main(sys.argv)
-  sys.exit(ret)
-
+  sys.exit(main(sys.argv))