Don't use ol.Collection in simple example

examples/simple.js

@@ -1,4 +1,3 @@
-goog.require('ol.Collection');
 goog.require('ol.Coordinate');
 goog.require('ol.Map');
 goog.require('ol.RendererHints');
@@ -8,11 +7,11 @@ goog.require('ol.source.OpenStreetMap');
 
 
 var map = new ol.Map({
-  layers: new ol.Collection([
+  layers: [
     new ol.layer.TileLayer({
       source: new ol.source.OpenStreetMap()
     })
-  ]),
+  ],
   renderers: ol.RendererHints.createFromQueryData(),
   target: 'map',
   view: new ol.View2D({