SOAP calls in Drupal result in "Call to undefined method CRM_Utils_SoapServer::getUsersTableName()" error

SOAP calls for processing bounces in Drupal result in "Call to undefined method CRM_Utils_SoapServer::getUsersTableName()" error.

This is occurring due to the following call in CRM/Utils/SoapServer.php on line 125:

$result =& $className::authenticate($name, $pass, $loadCMSBootstrap);

Which statically calls non-static method "authenticate" on the CRM_Utils_System_Drupal class and where the following code has been added

$userFrameworkUsersTableName = $this->getUsersTableName();

In this context "$this" becomes an instance of CRM_Utils_SoapServer rather than an instance of CRM_Utils_System_Drupal

Here are the relevant code changes:

1. method "authenticate" made non-static:

https://github.com/civicrm/civicrm-core/commit/17f443df7d2235655cbbfe68bfcf7a13a570b606

2. "$this->getUsersTableName();" line added:

https://github.com/civicrm/civicrm-core/commit/348754d5baf83293564406b5770f01edf647b74b

Proposed fix is to remove the deprecated static call in SoapServer.php and instantiate the Drupal class before calling the "authenticate" method on it:

Replace line 125:

$result =& $className::authenticate($name, $pass, $loadCMSBootstrap);

with

$ufInstance = new $this->ufClass();
$result =& $ufInstance->authenticate($name, $pass, $loadCMSBootstrap);

All of the other CRM_Utils_System_* cms specific files have the non-static authenticate method so this should work for all though we only tested that this patch works with Drupal.