10 files declare their use of HttpKernel

ClientTest.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/ClientTest.php
ContainerAwareHttpKernel.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DependencyInjection/ContainerAwareHttpKernel.php
HttpKernel.php in drupal/core/lib/Drupal/Core/HttpKernel.php
Definition of Drupal\Core\HttpKernel.
HttpKernelTest.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/HttpKernelTest.php
InlineFragmentRendererTest.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php
RequestDataCollectorTest.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/DataCollector/RequestDataCollectorTest.php
TestHttpKernel.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/TestHttpKernel.php
TestHttpKernel.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/HttpCache/TestHttpKernel.php
TestMultipleHttpKernel.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/HttpCache/TestMultipleHttpKernel.php
TraceableEventDispatcherTest.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/Debug/TraceableEventDispatcherTest.php