This change requires us to change the previous signature for the CheckOwners() hook to provide the server address and email regexp to use for parsing approvals from Rietveld.

Review URL: http://codereview.chromium.org/6657028

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@77891 0039d316-1c4b-4281-b951-d872f2087c98