releaseTile(tileDiv) {
    ee.MapTileManager.getInstance().abort(tileDiv.id);
    var tileImg = goog.dom.getFirstElementChild(tileDiv);
    this.tiles_.remove(tileImg);
    if (tileDiv.id !== '') {  // Out-of-bounds tiles have no ID.
      this.tilesFailed.remove(tileDiv.id);
      if (this.profiler_) {
        this.profiler_.removeTile(tileDiv.id);
      }
    }
  }
Implements releaseTile() for the google.maps.MapType
interface.
@param {Node} tileDiv The tile that has been released.