[gnome-boxes] CollectionView: Mark internal method as private

[Christophe Fergeau <teuf src gnome org>]

commit 5db84bf6aca18505b5a101827d4df5300c9c670d
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Wed Jun 27 16:09:54 2012 +0200

    CollectionView: Mark internal method as private
    
    The only user of this method is in CollectionView.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=681747

 src/collection-view.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/collection-view.vala b/src/collection-view.vala
index c225d34..b54d782 100644
--- a/src/collection-view.vala
+++ b/src/collection-view.vala
@@ -70,7 +70,7 @@ private class Boxes.CollectionView: Boxes.UI {
         fade_actor (actor, ui_state == UIState.COLLECTION ? 255 : 0);
     }
 
-    public void update_item_visible (CollectionItem item) {
+    private void update_item_visible (CollectionItem item) {
         var visible = false;
 
         // FIXME