Remove use of goog.object.getKeys

CONTRIBUTING.md

@@ -106,6 +106,8 @@ style of the existing OpenLayers 3 code, which includes:
 
  * Use `array.length = 0` instead of `goog.array.clear`.
 
+ * Use `Object.keys(obj)` instead of `goog.object.getKeys(obj)`.
+
  * Use bracket notation instead of `goog.object.set` and `goog.object.get` (with
    two arguments).
 

src/ol/pointer/mousesource.js

@@ -51,7 +51,7 @@ ol.pointer.MouseSource = function(dispatcher) {
 
   /**
    * @const
-   * @type {Object.<string, goog.events.BrowserEvent|Object>}
+   * @type {!Object.<string, goog.events.BrowserEvent|Object>}
    */
   this.pointerMap = dispatcher.pointerMap;
 

src/ol/pointer/mssource.js

@@ -54,7 +54,7 @@ ol.pointer.MsSource = function(dispatcher) {
 
   /**
    * @const
-   * @type {Object.<string, goog.events.BrowserEvent|Object>}
+   * @type {!Object.<string, goog.events.BrowserEvent|Object>}
    */
   this.pointerMap = dispatcher.pointerMap;
 

src/ol/pointer/pointereventhandler.js

@@ -61,7 +61,7 @@ ol.pointer.PointerEventHandler = function(element) {
 
   /**
    * @const
-   * @type {Object.<string, goog.events.BrowserEvent|Object>}
+   * @type {!Object.<string, goog.events.BrowserEvent|Object>}
    */
   this.pointerMap = {};
 

src/ol/pointer/touchsource.js

@@ -55,7 +55,7 @@ ol.pointer.TouchSource = function(dispatcher, mouseSource) {
 
   /**
    * @const
-   * @type {Object.<string, goog.events.BrowserEvent|Object>}
+   * @type {!Object.<string, goog.events.BrowserEvent|Object>}
    */
   this.pointerMap = dispatcher.pointerMap;
 
@@ -269,7 +269,7 @@ ol.pointer.TouchSource.prototype.vacuumTouches_ = function(inEvent) {
   var touchList = inEvent.getBrowserEvent().touches;
   // pointerMap.getCount() should be < touchList.length here,
   // as the touchstart has not been processed yet.
-  var keys = goog.object.getKeys(this.pointerMap);
+  var keys = Object.keys(this.pointerMap);
   var count = keys.length;
   if (count >= touchList.length) {
     var d = [];