Add BingMaps exports

src/ol/source/bingmaps.js

@@ -1,4 +1,5 @@
 goog.provide('ol.source.BingMaps');
+goog.provide('ol.BingMapsStyle');
 
 goog.require('goog.Uri');
 goog.require('goog.events');
@@ -21,15 +22,6 @@ ol.BingMapsStyle = {
 };
 
 
-/**
- * @typedef {{culture: (string|undefined),
- *            key: string,
- *            style: ol.BingMapsStyle}}
- */
-ol.source.BingMapsOptions;
-
-
-
 /**
  * @constructor
  * @extends {ol.source.TileSource}