Remove more now-unused code.

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

-<?php
-
-/**
- * @file
- * Definition of Drupal\Core\Routing\FinalMatcherInterface.
- */
-
-namespace Drupal\Core\Routing;
-
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Routing\RouteCollection;
-
-/**
- * A FinalMatcher returns only one route from a collection of candidate routes.
- */
-interface FinalMatcherInterface {
-
-  /**
-   * Sets the route collection this matcher should use.
-   *
-   * @param \Symfony\Component\Routing\RouteCollection $collection
-   *   The collection against which to match.
-   *
-   * @return \Drupal\Core\Routing\FinalMatcherInterface
-   *   The current matcher.
-   */
-  public function setCollection(RouteCollection $collection);
-
-  /**
-   * Matches a request against multiple routes.
-   *
-   * @param \Symfony\Component\HttpFoundation\Request $request
-   *   A Request object against which to match.
-   *
-   * @return array
-   *   An array of parameters.
-   */
-  public function matchRequest(Request $request);
-}

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

-<?php
-
-/**
- * @file
- * Definition of Drupal\Core\Routing\PartialMatcher.
- */
-
-namespace Drupal\Core\Routing;
-
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Routing\RouteCollection;
-
-/**
- * Utility base class for partial matchers.
- */
-abstract class PartialMatcher implements PartialMatcherInterface {
-
-  /**
-   * The RouteCollection this matcher should match against.
-   *
-   * @var \Symfony\Component\Routing\RouteCollection
-   */
-  protected $routes;
-
-  /**
-   * Sets the route collection this matcher should use.
-   *
-   * @param \Symfony\Component\Routing\RouteCollection $collection
-   *   The collection against which to match.
-   *
-   * @return \Drupal\Core\Routing\PartialMatcherInterface
-   *   The current matcher.
-   */
-  public function setCollection(RouteCollection $collection) {
-    $this->routes = $collection;
-
-    return $this;
-  }
-
-}

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

-<?php
-
-/**
- * @file
- * Definition of Drupal\Core\Routing\PathMatcherInterface.
- */
-
-namespace Drupal\Core\Routing;
-
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Routing\RouteCollection;
-
-/**
- * A PartialMatcher works like a UrlMatcher, but will return multiple candidate routes.
- */
-interface PartialMatcherInterface {
-
-  /**
-   * Sets the route collection this matcher should use.
-   *
-   * @param \Symfony\Component\Routing\RouteCollection $collection
-   *   The collection against which to match.
-   *
-   * @return \Drupal\Core\Routing\PartialMatcherInterface
-   *   The current matcher.
-   */
-  public function setCollection(RouteCollection $collection);
-
-  /**
-   * Matches a request against multiple routes.
-   *
-   * @param \Symfony\Component\HttpFoundation\Request $request
-   *   A Request object against which to match.
-   *
-   * @return \Symfony\Component\Routing\RouteCollection
-   *   A RouteCollection of matched routes.
-   */
-  public function matchRequestPartial(Request $request);
-}