wp_dropdown_pages() is failing in Beta-2

[beautomated]

The following code works in v3.4.2, but not in v3.5-beta2-22455. The dropdown containing the pages is not echo'd as is the default behavior.
See: ​http://codex.wordpress.org/Function_Reference/wp_dropdown_pages
Here's the unit test Plugin:

<?php
/*
        Plugin Name: Sean's Unit Test
        Plugin URI: http://www.beautomated.com/
        Description: Runs a unit test of some simple code.
        Author: beAutomated
        Version: 0.1-alpha
        Author URI: http://www.beautomated.com/
 */

add_action( 'admin_init', 'seantest_admin_init' );

function seantest_admin_init() {
        echo '<p>Before Unit Test</p>';
        wp_dropdown_pages();
        echo '<p>After Unit Test</p>';
}

?>

[rmccue]

Confirmed, regression in r22445, see #20376.

[nacin]

In 22464:

Revert [22445]. see #20376. fixes #22389.