Adds dewittj to the notification owners file.

Also reorder the file alphabetically

NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/13704013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192597 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/notifications/OWNERS

-stevenjb@chromium.org
+dewittj@chromium.org
 miket@chromium.org
 mukai@chromium.org
+stevenjb@chromium.org

chrome/browser/ui/views/message_center/OWNERS

+dewittj@chromium.org
 mukai@chromium.org
 miket@chromium.org

ui/message_center/OWNERS

-stevenjb@chromium.org
+dewittj@chromium.org
 miket@chromium.org
 mukai@chromium.org
+stevenjb@chromium.org