Remove ol.control.Control.bindMouseOutFocusOutBlur function

It was a workaround added in #1761 to hide the button tooltip on
OSX / Chrome 32 and 33.

Because we're not using the tooltips anymore (see #2781) and this
version of chrome is deprecated this workaround can be removed.

src/ol/control/control.js

@@ -3,7 +3,6 @@ goog.provide('ol.control.Control');
 goog.require('goog.array');
 goog.require('goog.dom');
 goog.require('goog.events');
-goog.require('goog.events.EventType');
 goog.require('ol.MapEventType');
 goog.require('ol.Object');
 
@@ -79,24 +78,6 @@ ol.control.Control = function(options) {
 goog.inherits(ol.control.Control, ol.Object);
 
 
-/**
- * Bind a listener that blurs the passed element on any mouseout- or
- * focusout-event.
- *
- * @param {!Element} button The button which shall blur on mouseout- or
- *     focusout-event.
- * @protected
- */
-ol.control.Control.bindMouseOutFocusOutBlur = function(button) {
-  goog.events.listen(button, [
-    goog.events.EventType.MOUSEOUT,
-    goog.events.EventType.FOCUSOUT
-  ], /** @this {Element} */ function() {
-    this.blur();
-  }, false);
-};
-
-
 /**
  * @inheritDoc
  */