Remove unused private variables in ol.renderer.canvas.Map

src/ol/renderer/canvas/canvasmaprenderer.js

@@ -11,7 +11,6 @@ goog.require('ol.RendererType');
 goog.require('ol.array');
 goog.require('ol.css');
 goog.require('ol.dom');
-goog.require('ol.extent');
 goog.require('ol.layer.Image');
 goog.require('ol.layer.Layer');
 goog.require('ol.layer.Tile');
@@ -47,12 +46,6 @@ ol.renderer.canvas.Map = function(container, map) {
    */
   this.context_ = ol.dom.createCanvasContext2D();
 
-  /**
-   * @private
-   * @type {CanvasRenderingContext2D}
-   */
-  this.renderContext_ = ol.dom.createCanvasContext2D();
-
   /**
    * @private
    * @type {HTMLCanvasElement}
@@ -64,24 +57,6 @@ ol.renderer.canvas.Map = function(container, map) {
   this.canvas_.className = ol.css.CLASS_UNSELECTABLE;
   goog.dom.insertChildAt(container, this.canvas_, 0);
 
-  /**
-   * @private
-   * @type {HTMLCanvasElement}
-   */
-  this.renderCanvas_ = this.renderContext_.canvas;
-
-  /**
-   * @private
-   * @type {ol.Coordinate}
-   */
-  this.pixelCenter_ = [0, 0];
-
-  /**
-   * @private
-   * @type {ol.Extent}
-   */
-  this.pixelExtent_ = ol.extent.createEmpty();
-
   /**
    * @private
    * @type {boolean}