Remove usage of goog.dom.TagName enum

src/ol/overlay.js

@@ -4,7 +4,6 @@ goog.provide('ol.OverlayProperty');
 
 goog.require('goog.asserts');
 goog.require('goog.dom');
-goog.require('goog.dom.TagName');
 goog.require('goog.events');
 goog.require('goog.style');
 goog.require('ol.Coordinate');
@@ -91,7 +90,7 @@ ol.Overlay = function(options) {
    * @private
    * @type {Element}
    */
-  this.element_ = goog.dom.createDom(goog.dom.TagName.DIV, {
+  this.element_ = goog.dom.createDom('DIV', {
     'class': 'ol-overlay-container'
   });
   this.element_.style.position = 'absolute';