Auto-size header row.

Author: MKirova

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.component.ts

@@ -212,6 +212,13 @@ export class IgxPivotGridComponent extends IgxGridBaseDirective implements OnIni
        this.reflow();
    }
 
+    /**
+     * @hidden
+     * @internal
+     */
+    protected calcGridHeadRow() {
+    }
+
     /**
      * @hidden
      */