Remove upload dependency.

This is towards making trychange.py work mostly standalone for the webkit try server.

TEST=unit tests and tested both gcl try and git-try.

Review URL: http://codereview.chromium.org/501143

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@35071 0039d316-1c4b-4281-b951-d872f2087c98