Remove variable for Corner and Relationship

src/ol/extent/Corner.js

@@ -5,11 +5,9 @@
  * Extent corner.
  * @enum {string}
  */
-var _ol_extent_Corner_ = {
+export default {
   BOTTOM_LEFT: 'bottom-left',
   BOTTOM_RIGHT: 'bottom-right',
   TOP_LEFT: 'top-left',
   TOP_RIGHT: 'top-right'
 };
-
-export default _ol_extent_Corner_;

src/ol/extent/Relationship.js

@@ -5,7 +5,7 @@
  * Relationship to an extent.
  * @enum {number}
  */
-var _ol_extent_Relationship_ = {
+export default {
   UNKNOWN: 0,
   INTERSECTING: 1,
   ABOVE: 2,
@@ -13,5 +13,3 @@ var _ol_extent_Relationship_ = {
   BELOW: 8,
   LEFT: 16
 };
-
-export default _ol_extent_Relationship_;