Revert "Add ol.BrowserFeature.HAS_FULLSCREEN constant"

This reverts commit 5a940c207a.

Detection of full screeen support requires the document to have a body.
This is not the case if ol3 is loaded in the head.  Therefore, defer the
test for full screen support to when it is needed.

src/ol/browserfeature.js

@@ -3,7 +3,6 @@ goog.provide('ol.BrowserFeature');
 goog.require('goog.dom');
 goog.require('goog.dom.TagName');
 goog.require('goog.userAgent');
-goog.require('googx.dom.fullscreen');
 goog.require('ol.webgl');
 
 
@@ -142,15 +141,6 @@ ol.BrowserFeature.HAS_DEVICE_ORIENTATION =
 ol.BrowserFeature.HAS_DOM = ol.ENABLE_DOM;
 
 
-/**
- * True if browser supports the fullscreen API.
- * @const
- * @type {boolean}
- * @todo stability experimental
- */
-ol.BrowserFeature.HAS_FULLSCREEN = googx.dom.fullscreen.isSupported();
-
-
 /**
  * Is HTML5 geolocation supported in the current browser?
  * @const