Right now we require approval from someone, and we require an owner
approval, but we don't require an approval from an owner *other than
the patch other*. It's conceivable that we might want this, so
I am making this a configurable argument to the presubmit check.

This will also be needed to ensure that we don't suggest you as an
owner for your own patches, when we actually know who you are.

R=maruel@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/12326151

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@185294 0039d316-1c4b-4281-b951-d872f2087c98