Fix python scripts in src/chrome/

chrome/test/pyautolib/fetch_prebuilt_pyauto.py

Index: chrome/test/pyautolib/fetch_prebuilt_pyauto.py
diff --git a/chrome/test/pyautolib/fetch_prebuilt_pyauto.py b/chrome/test/pyautolib/fetch_prebuilt_pyauto.py
old mode 100644
new mode 100755
index 9b4c367ee486ec3b2263def3a40e718688c93928..a9833121e8ce34ca19186c01fcc6c657ebf1e095
--- a/chrome/test/pyautolib/fetch_prebuilt_pyauto.py
+++ b/chrome/test/pyautolib/fetch_prebuilt_pyauto.py
@@ -1,5 +1,4 @@
-#!/usr/bin/python
-
+#!/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.
@@ -172,7 +171,8 @@ class FetchPrebuilt(object):
       os.symlink(framework, dest)
 
     print 'Prepared binaries in "%s"' % self._outdir
+    return 0
 
 
 if __name__ == '__main__':
-  FetchPrebuilt().Run()
+  sys.exit(FetchPrebuilt().Run())