12 files declare their use of ContainerBuilder

bootstrap.inc in drupal/core/includes/bootstrap.inc
Functions that need to be loaded on every Drupal request.
DrupalKernel.php in drupal/core/lib/Drupal/Core/DrupalKernel.php
Definition of Drupal\Core\DrupalKernel.
DrupalUnitTestBase.php in drupal/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
Contains Drupal\simpletest\DrupalUnitTestBase.
HttpKernelTest.php in drupal/core/tests/Drupal/Tests/Core/HttpKernelTest.php
Contains \Drupal\Tests\Core\HttpKernelTest.
LanguageDependencyInjectionTest.php in drupal/core/modules/language/lib/Drupal/language/Tests/LanguageDependencyInjectionTest.php
Definition of Drupal\language\Tests\LanguageDependencyInjectionTest.
MachineNameControllerTest.php in drupal/core/modules/system/tests/Drupal/system/Tests/Transliteration/MachineNameControllerTest.php
Contains \Drupal\system\Tests\Transliteration\MachineNameControllerTest.
RoleAccessCheckTest.php in drupal/core/tests/Drupal/Tests/Core/Route/RoleAccessCheckTest.php
Contains \Drupal\Tests\Core\Route\RoleAccessCheckTest.
RolesRidTest.php in drupal/core/modules/user/tests/Drupal/Tests/user/Views/Argument/RolesRidTest.php
Contains \Drupal\Tests\user\Views\Argument\RolesRidTest.
TestBase.php in drupal/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
Definition of Drupal\simpletest\TestBase.
TreeAccessTest.php in drupal/core/modules/system/lib/Drupal/system/Tests/Menu/TreeAccessTest.php
Contains \Drupal\system\Tests\Menu\TreeAccessTest.
UpcastingTest.php in drupal/core/modules/system/lib/Drupal/system/Tests/ParamConverter/UpcastingTest.php
Contains Drupal\system\Tests\ParamConverter\UpcastingTest.
UpgradePathTestBase.php in drupal/core/modules/system/lib/Drupal/system/Tests/Upgrade/UpgradePathTestBase.php
Definition of Drupal\system\Tests\Upgrade\UpgradePathTestBase.