10 files declare their use of RouteNotFoundException

ChainRouter.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/ChainRouter.php
ContentAwareGenerator.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/ContentAwareGenerator.php
DynamicRouter.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/DynamicRouter.php
NullGenerator.php in drupal/core/lib/Drupal/Core/Routing/NullGenerator.php
Contains Drupal\Core\Routing\NullGenerator.
ProviderBasedGenerator.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/ProviderBasedGenerator.php
RouteProvider.php in drupal/core/lib/Drupal/Core/Routing/RouteProvider.php
Contains Drupal\Core\Routing\RouteProvider.
RouteProviderTest.php in drupal/core/modules/system/lib/Drupal/system/Tests/Routing/RouteProviderTest.php
Contains Drupal\system\Tests\Routing\RouteProviderTest.
UrlGenerator.php in drupal/core/lib/Drupal/Core/Routing/UrlGenerator.php
Contains Drupal\Core\Routing\UrlGenerator.
UrlGenerator.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Generator/UrlGenerator.php
UrlGeneratorInterface.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Generator/UrlGeneratorInterface.php