Remove defaultPrevented attribut from ol.MapEvent

already defined in parent class: http://docs.closure-library.googlecode.com/git/class_goog_events_Event.html

src/ol/mapevent.js

@@ -30,11 +30,6 @@ ol.MapEvent = function(type, map, opt_frameState) {
    */
   this.map = map;
 
-  /**
-   * @type {boolean}
-   */
-  this.defaultPrevented = false;
-
   /**
    * @type {?ol.FrameState}
    */
@@ -42,12 +37,3 @@ ol.MapEvent = function(type, map, opt_frameState) {
 
 };
 goog.inherits(ol.MapEvent, goog.events.Event);
-
-
-/**
- * Prevents the default action.
- */
-ol.MapEvent.prototype.preventDefault = function() {
-  goog.base(this, 'preventDefault');
-  this.defaultPrevented = true;
-};