tweak octal numbers style to work with python-3

BUG=None
TEST=`./run_tests` passed

Change-Id: Ife102f80efdb5e040dc2ba96ac7aa4ee3f7a6c75
Reviewed-on: https://chromium-review.googlesource.com/173729
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/deploy_chrome.py b/scripts/deploy_chrome.py
index 67c8013..4793c22 100644
--- a/scripts/deploy_chrome.py
+++ b/scripts/deploy_chrome.py
@@ -497,7 +497,7 @@
   staging directory.
   """
   osutils.SafeMakedirs(staging_dir)
-  os.chmod(staging_dir, 0755)
+  os.chmod(staging_dir, 0o755)
   if options.build_dir:
     with _StripBinContext(options) as strip_bin:
       strip_flags = (None if options.strip_flags is None else