Index: wp-admin/includes/theme.php
===================================================================
--- wp-admin/includes/theme.php	(revision 17236)
+++ wp-admin/includes/theme.php	(working copy)
@@ -43,17 +43,19 @@
  * @since 2.8.0
  *
  * @param string $template Template directory of the theme to delete
+ * @param string $redirect Redirect to page when complete.
  * @return mixed
  */
-function delete_theme($template) {
+function delete_theme($template, $redirect = '') {
 	global $wp_filesystem;
 
 	if ( empty($template) )
 		return false;
 
 	ob_start();
-	$url = wp_nonce_url('themes.php?action=delete&template=' . $template, 'delete-theme_' . $template);
-	if ( false === ($credentials = request_filesystem_credentials($url)) ) {
+	if ( empty( $redirect ) )
+		$redirect = wp_nonce_url('themes.php?action=delete&template=' . $template, 'delete-theme_' . $template);
+	if ( false === ($credentials = request_filesystem_credentials($redirect)) ) {
 		$data = ob_get_contents();
 		ob_end_clean();
 		if ( ! empty($data) ){
Index: wp-admin/network/themes.php
===================================================================
--- wp-admin/network/themes.php	(revision 17236)
+++ wp-admin/network/themes.php	(working copy)
@@ -160,7 +160,7 @@
 			} // Endif verify-delete
 
 			foreach ( $themes as $theme )
-				$delete_result = delete_theme( $theme );
+				$delete_result = delete_theme( $theme, esc_url( add_query_arg( array('verify-delete' => 1), $_SERVER['REQUEST_URI'] ) ) );
 			wp_redirect( add_query_arg( 'deleted', count( $themes ), $referer ) );
 			exit;
 			break;