18 files declare their use of ResourceNotFoundException

ChainRouter.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/ChainRouter.php
DynamicRouter.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/DynamicRouter.php
FinalMatcherInterface.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/NestedMatcher/FinalMatcherInterface.php
LegacyUrlMatcher.php in drupal/core/lib/Drupal/Core/LegacyUrlMatcher.php
Definition of Drupal\Core\LegacyUrlMatcher.
NestedMatcher.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/NestedMatcher/NestedMatcher.php
NestedMatcherTest.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/Tests/NestedMatcher/NestedMatcherTest.php
RedirectableUrlMatcher.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php
RequestMatcherInterface.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php
RouteFilterInterface.php in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/NestedMatcher/RouteFilterInterface.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.
RouterListener.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/EventListener/RouterListener.php
UrlMatcher.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Matcher/UrlMatcher.php
UrlMatcherInterface.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php
UrlMatcherTest.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Tests/Matcher/UrlMatcherTest.php
url_matcher1.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Tests/Fixtures/dumper/url_matcher1.php
url_matcher2.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Tests/Fixtures/dumper/url_matcher2.php
url_matcher3.php in drupal/core/vendor/symfony/routing/Symfony/Component/Routing/Tests/Fixtures/dumper/url_matcher3.php