CMDupdate and CMDsync have different option parsers, which means they pass 
different options objects to the same underlying code!

R=agable@chromium.org, dnj@chromium.org, smut@chromium.org
BUG=601564

Review URL: https://codereview.chromium.org/1869593004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299777 0039d316-1c4b-4281-b951-d872f2087c98