Fix format errors found by autopep8.

Most of them are whitespace error.

BUG=None
TEST=make test

Change-Id: I3850dbf1ecc567e8c4bf1d00aba94f844328cbc3
Reviewed-on: https://chromium-review.googlesource.com/1218307
Commit-Ready: Pi-Hsun Shih <pihsun@chromium.org>
Tested-by: Pi-Hsun Shih <pihsun@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
diff --git a/py/toolkit/installer.py b/py/toolkit/installer.py
index 3acc01f..519563c 100755
--- a/py/toolkit/installer.py
+++ b/py/toolkit/installer.py
@@ -382,7 +382,7 @@
                   os.path.join(output_dir, 'app'))
 
   # Give overlordd execution permission
-  os.chmod(os.path.join(output_dir, 'overlordd'), 0755)
+  os.chmod(os.path.join(output_dir, 'overlordd'), 0o755)
   print "Extracted overlord under '%s'" % output_dir