shutdown() is protected in our superclass, let's not widen access.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3566 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/sprite/Sprite.java

@@ -379,7 +379,7 @@ public abstract class Sprite extends AbstractMedia
     }
 
     // documentation inherited
-    public void shutdown ()
+    protected void shutdown ()
     {
         super.shutdown();
         cancelMove(); // cancel any active path