Remove crossOrigin null option for OpenSeaMap source

examples/localized-openstreetmap.html

@@ -3,8 +3,7 @@ layout: example.html
 title: Localized OpenStreetMap
 shortdesc: Example of a localized OpenStreetMap map with a custom tile server and a custom attribution.
 docs: >
-  <p>The base layer is <a href="http://www.opencyclemap.org/">OpenCycleMap</a> with an overlay from <a href="http://www.openseamap.org/">OpenSeaMap</a>. The OpenSeaMap tile server
-  does not support <a href="http://enable-cors.org/">CORS</a> headers.</p>
-tags: "cors, localized-openstreetmap, openseamap, openstreetmap"
+  <p>The base layer is <a href="http://www.opencyclemap.org/">OpenCycleMap</a> with an overlay from <a href="http://www.openseamap.org/">OpenSeaMap</a>.
+tags: "localized-openstreetmap, openseamap, openstreetmap"
 ---
 <div id="map" class="map"></div>

examples/localized-openstreetmap.js

@@ -28,7 +28,6 @@ var openSeaMapLayer = new ol.layer.Tile({
       }),
       ol.source.OSM.ATTRIBUTION
     ],
-    crossOrigin: null,
     url: 'http://tiles.openseamap.org/seamark/{z}/{x}/{y}.png'
   })
 });