10 files declare their use of EntityFormController

AccountFormController.php in drupal/core/modules/user/lib/Drupal/user/AccountFormController.php
Definition of Drupal\user\AccountFormController.
CategoryFormController.php in drupal/core/modules/contact/lib/Drupal/contact/CategoryFormController.php
Definition of Drupal\contact\CategoryFormController.
CommentFormController.php in drupal/core/modules/comment/lib/Drupal/comment/CommentFormController.php
Definition of Drupal\comment\CommentFormController.
ConfigTestFormController.php in drupal/core/modules/config/tests/config_test/lib/Drupal/config_test/ConfigTestFormController.php
Contains Drupal\config_test\ConfigTestFormController.
NodeFormController.php in drupal/core/modules/node/lib/Drupal/node/NodeFormController.php
Definition of Drupal\node\NodeFormController.
PictureMappingFormController.php in drupal/core/modules/picture/lib/Drupal/picture/PictureMappingFormController.php
Contains Drupal\picture\PictureFormController.
TermFormController.php in drupal/core/modules/taxonomy/lib/Drupal/taxonomy/TermFormController.php
Definition of Drupal\taxonomy\TermFormController.
TestEntityFormController.php in drupal/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/TestEntityFormController.php
Definition of Drupal\field_test\TestEntityFormController.
ViewFormControllerBase.php in drupal/core/modules/views/views_ui/lib/Drupal/views_ui/ViewFormControllerBase.php
Contains Drupal\views_ui\ViewFormControllerBase.
VocabularyFormController.php in drupal/core/modules/taxonomy/lib/Drupal/taxonomy/VocabularyFormController.php
Definition of Drupal\taxonomy\VocabularyFormController.