Remove unused goog.require

src/ol/control/zoomcontrol.js

@@ -1,6 +1,5 @@
 goog.provide('ol.control.Zoom');
 
-goog.require('goog.asserts');
 goog.require('goog.dom');
 goog.require('goog.dom.TagName');
 goog.require('goog.events');

src/ol/geolocation.js

@@ -3,7 +3,6 @@
 goog.provide('ol.Geolocation');
 goog.provide('ol.GeolocationProperty');
 
-goog.require('goog.asserts');
 goog.require('goog.events');
 goog.require('goog.events.EventType');
 goog.require('goog.math');

src/ol/interaction/dragboxinteraction.js

@@ -2,7 +2,6 @@
 goog.provide('ol.DragBoxEvent');
 goog.provide('ol.interaction.DragBox');
 
-goog.require('goog.asserts');
 goog.require('goog.events.Event');
 goog.require('goog.functions');
 goog.require('ol');