Issue #2442173 by mpdonadio: Drop the unused class RouteBuilderStatic

core/lib/Drupal/Core/Routing/RouteBuilderStatic.php

-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Routing\RouteBuilderStatic.
- */
-
-namespace Drupal\Core\Routing;
-
-/**
- * This builds a static version of the router.
- */
-class RouteBuilderStatic implements RouteBuilderInterface {
-
-  /**
-   * Marks a rebuild as being necessary.
-   *
-   * @var bool
-   */
-  protected $rebuildNeeded = FALSE;
-
-  /**
-   * {@inheritdoc}
-   */
-  public function rebuild() {
-    // @todo Add the route for the batch pages when that conversion happens,
-    //   http://drupal.org/node/1987816.
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function rebuildIfNeeded(){
-    if ($this->rebuildNeeded && $this->rebuild()) {
-      $this->rebuildNeeded = FALSE;
-      return TRUE;
-    }
-    return FALSE;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function setRebuildNeeded() {
-    $this->rebuildNeeded = TRUE;
-  }
-
-  public function getCollectionDuringRebuild() {
-    return FALSE;
-  }
-
-}