Array.indexOf() turns out to be there, just not documented.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4037 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/ArrayUtil.as

@@ -5,21 +5,6 @@ package com.threerings.util {
  */
 public class ArrayUtil
 {
-    /**
-     * Return the first index of the specified element, or -1 if not present.
-     */
-    public static function indexOf (arr :Array, element :Object) :int
-    {
-        // return mx.utils.ArrayUtil.getItemIndex(element, arr);
-        //
-        for (var ii :int = 0; ii < arr.length; ii++) {
-            if (arr[ii] === element) {
-                return ii;
-            }
-        }
-        return -1;
-    }
-
     /**
      * Remove the first instance of the specified element from the array.
      */

src/as/com/threerings/util/ObserverList.as

@@ -28,7 +28,7 @@ public class ObserverList
      */
     public function add (observer :Object) :void
     {
-        if (ArrayUtil.indexOf(_list, observer) == -1) {
+        if (_list.indexOf(observer) == -1) {
             _list.push(observer);
         }
     }