This fixes bugs 76724. We will now allow approvals from
only non-owners to be sufficient if the patch is from an OWNER.

Also, this strips out the code for suggesting reviewers during upload completely. I've come to believe that this should be done by gcl and git-cl directly rather than through a presubmit hook, when the change is being initially created. CheckOwners() is now a no-op on upload.

(We might need to add a new value to the codereview.settings file instead to indicate if we want this to happen).

Review URL: http://codereview.chromium.org/6730020

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@79339 0039d316-1c4b-4281-b951-d872f2087c98