6 files declare their use of AccessAwareRouterInterface

AccessAwareRouterTest.php in core/tests/Drupal/Tests/Core/Routing/AccessAwareRouterTest.php
CustomPageExceptionHtmlSubscriber.php in core/lib/Drupal/Core/EventSubscriber/CustomPageExceptionHtmlSubscriber.php
CustomPageExceptionHtmlSubscriberTest.php in core/tests/Drupal/Tests/Core/EventSubscriber/CustomPageExceptionHtmlSubscriberTest.php
EntityResource.php in core/modules/rest/src/Plugin/rest/resource/EntityResource.php
PathValidator.php in core/lib/Drupal/Core/Path/PathValidator.php
RouteAccessResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/RouteAccessResponseSubscriber.php

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.