Simplify vector tile code

src/ol/VectorTile.js

@@ -61,12 +61,6 @@ class VectorTile extends Tile {
      */
     this.projection_ = null;
 
-    /**
-     * @private
-     * @type {Object<string, import("./render/canvas/ExecutorGroup.js").default>}
-     */
-    this.executorGroups_ = {};
-
     /**
      * @private
      * @type {import("./Tile.js").LoadFunction}
@@ -85,10 +79,7 @@ class VectorTile extends Tile {
    * @inheritDoc
    */
   disposeInternal() {
-    this.features_ = null;
-    this.executorGroups_ = {};
-    this.state = TileState.ABORT;
-    this.changed();
+    this.setState(TileState.ABORT);
     super.disposeInternal();
   }
 
@@ -137,15 +128,6 @@ class VectorTile extends Tile {
     return this.projection_;
   }
 
-  /**
-   * @param {string} layerId UID of the layer.
-   * @param {string} key Key.
-   * @return {import("./render/canvas/ExecutorGroup.js").default} Executor group.
-   */
-  getExecutorGroup(layerId, key) {
-    return this.executorGroups_[layerId + ',' + key];
-  }
-
   /**
    * @inheritDoc
    */
@@ -214,15 +196,6 @@ class VectorTile extends Tile {
     this.projection_ = projection;
   }
 
-  /**
-   * @param {string} layerId UID of the layer.
-   * @param {string} key Key.
-   * @param {import("./render/canvas/ExecutorGroup.js").default} executorGroup Executor group.
-   */
-  setExecutorGroup(layerId, key, executorGroup) {
-    this.executorGroups_[layerId + ',' + key] = executorGroup;
-  }
-
   /**
    * Set the feature loader for reading this tile's features.
    * @param {import("./featureloader.js").FeatureLoader} loader Feature loader.