Cleaned up ol/pointer classes

src/ol/pointer/PointerEventHandler.js

@@ -1,6 +1,7 @@
 /**
  * @module ol/pointer/PointerEventHandler
  */
+
 // Based on https://github.com/Polymer/PointerEvents
 
 // Copyright (c) 2013 The Polymer Authors. All rights reserved.
@@ -31,7 +32,6 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import {inherits} from '../util.js';
 import {listen, unlisten} from '../events.js';
 import EventTarget from '../events/EventTarget.js';
 import {POINTER, MSPOINTER, TOUCH} from '../has.js';
@@ -83,14 +83,13 @@ const CLONE_PROPS = [
 ];
 
 
-/**
- * @constructor
- * @extends {module:ol/events/EventTarget}
- * @param {Element|HTMLDocument} element Viewport element.
- */
-class PointerEventHandler {
+class PointerEventHandler extends EventTarget {
+
+  /**
+   * @param {Element|HTMLDocument} element Viewport element.
+   */
   constructor(element) {
-    EventTarget.call(this);
+    super();
 
     /**
      * @const
@@ -416,6 +415,4 @@ class PointerEventHandler {
   }
 }
 
-inherits(PointerEventHandler, EventTarget);
-
 export default PointerEventHandler;