Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php	(revision 17280)
+++ wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -264,11 +264,12 @@
 		$screen = get_current_screen();
 
 		if ( is_null( $this->_actions ) ) {
-			$this->_actions = $this->get_bulk_actions();
+			$no_new_actions = $this->_actions = $this->get_bulk_actions();
+			// This filter can currently only be used to remove actions.
 			$this->_actions = apply_filters( 'bulk_actions-' . $screen->id, $this->_actions );
+			$this->_actions = array_intersect_key( $this->_actions, $no_new_actions );
 			$two = '';
-		}
-		else {
+		} else {
 			$two = '2';
 		}