Reworked attribution handling

src/ol/imagebase.js

@@ -13,18 +13,11 @@ goog.require('ol.events.EventType');
  * @param {number|undefined} resolution Resolution.
  * @param {number} pixelRatio Pixel ratio.
  * @param {ol.ImageState} state State.
- * @param {Array.<ol.Attribution>} attributions Attributions.
  */
-ol.ImageBase = function(extent, resolution, pixelRatio, state, attributions) {
+ol.ImageBase = function(extent, resolution, pixelRatio, state) {
 
   ol.events.EventTarget.call(this);
 
-  /**
-   * @private
-   * @type {Array.<ol.Attribution>}
-   */
-  this.attributions_ = attributions;
-
   /**
    * @protected
    * @type {ol.Extent}
@@ -61,14 +54,6 @@ ol.ImageBase.prototype.changed = function() {
 };
 
 
-/**
- * @return {Array.<ol.Attribution>} Attributions.
- */
-ol.ImageBase.prototype.getAttributions = function() {
-  return this.attributions_;
-};
-
-
 /**
  * @return {ol.Extent} Extent.
  */