8 files declare their use of FilterPluginBase in Views (for Drupal 7) 8.3

Access.php in lib/Views/node/Plugin/views/filter/Access.php

Definition of Views\node\Plugin\views\filter\Access.

FilterTest.php in tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/filter/FilterTest.php

Definition of Drupal\views_test_data\Plugin\views\filter\FilterTest.

HistoryUserTimestamp.php in lib/Views/node/Plugin/views/filter/HistoryUserTimestamp.php

Definition of Views\node\Plugin\views\filter\HistoryUserTimestamp.

NodeTnid.php in lib/Views/translation/Plugin/views/filter/NodeTnid.php

Definition of Views\translation\Plugin\views\filter\NodeTnid.

NodeTnidChild.php in lib/Views/translation/Plugin/views/filter/NodeTnidChild.php

Definition of Views\translation\Plugin\views\filter\NodeTnidChild.

Search.php in lib/Views/search/Plugin/views/filter/Search.php

Definition of Views\search\Plugin\views\filter\Search.

Status.php in lib/Views/node/Plugin/views/filter/Status.php

Definition of Views\node\Plugins\views\filter\Status.

UserUid.php in lib/Views/comment/Plugin/views/filter/UserUid.php

Definition of Views\comment\Plugin\views\filter\UserUid.