Proper destruction.

src/ol/control/Control.js

@@ -1,6 +1,8 @@
 goog.provide('ol.control');
 goog.provide('ol.control.Control');
 
+goog.require('goog.object');
+
 
 /**
  * @enum {Object}
@@ -75,4 +77,9 @@ ol.control.Control.prototype.deactivate = function() {
     var returnValue = this.active_;
     this.active_ = true;
     return returnValue;
+};
+
+ol.control.Control.prototype.destroy = function() {
+    this.deactivate();
+    goog.object.clear(this);
 };

src/ol/event/Drag.js

@@ -1,8 +1,8 @@
 goog.provide('ol.event.Drag');
 
-goog.require('ol.event.ISequence');
 goog.require('ol.event');
-goog.require('goog.object');
+goog.require('ol.event.ISequence');
+
 goog.require('goog.fx.Dragger');
 goog.require('goog.fx.DragEvent');
 goog.require('goog.fx.Dragger.EventType');
@@ -74,7 +74,7 @@ ol.event.Drag = function(target) {
 /** @inheritDoc */
 ol.event.Drag.prototype.destroy = function() {
     this.dragger_.dispose();
-    goog.object.clear(this);
+    delete this.dragger_;
 };
 
 

src/ol/event/Scroll.js

@@ -2,6 +2,7 @@ goog.provide('ol.event.Scroll');
 
 goog.require('ol.event.ISequence');
 goog.require('ol.event');
+
 goog.require('goog.events.MouseWheelHandler');
 
 
@@ -37,6 +38,7 @@ ol.event.Scroll = function(target) {
 /** @inheritDoc */
 ol.event.Scroll.prototype.destroy = function() {
     this.handler_.dispose();
+    delete this.handler_;
 };