It is because upload.py doesn't use sane default parameter.

TBR=dpranke@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7075029

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@87012 0039d316-1c4b-4281-b951-d872f2087c98