Replaced by Sanitizer::validateEmail()
Change-Id: I7b4ef438dd31a2dbc641bb06bea8e256e0f5dd1f
$url: URL used to upload from
&$allowed: Boolean indicating if uploading is allowed for given URL
-'isValidEmailAddr': Override the result of User::isValidEmailAddr(), for
+'isValidEmailAddr': Override the result of Sanitizer::validateEmail(), for
instance to return false if the domain name doesn't match your organization.
$addr: The e-mail address entered by the user
&$result: Set this and return false to override the internal checks