Update upload.py to r680 from upstream.

Removed all the local hacks as they are not necessary anymore.

R=dpranke@chromium.org
BUG=none
TEST=manually verified that HTTP 302 redirect works fine.

Review URL: http://codereview.chromium.org/6730004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@79296 0039d316-1c4b-4281-b951-d872f2087c98