Issue #1765728 by dawehner, damiankloip: Cleanup methods on HandlerBase.

help/api-upgrading.html

includes/admin.inc

lib/Drupal/views/ManyToOneHelper.php

lib/Drupal/views/Plugin/views/HandlerBase.php

lib/Drupal/views/Plugin/views/access/AccessPluginBase.php

lib/Drupal/views/Plugin/views/access/Permission.php

lib/Drupal/views/Plugin/views/access/Role.php

lib/Drupal/views/Plugin/views/area/AreaPluginBase.php

lib/Drupal/views/Plugin/views/area/Broken.php

lib/Drupal/views/Plugin/views/area/Text.php

lib/Drupal/views/Plugin/views/area/TextCustom.php

...Drupal/views/Plugin/views/argument/ArgumentPluginBase.php

lib/Drupal/views/Plugin/views/argument/Broken.php

lib/Drupal/views/Plugin/views/argument/Formula.php

lib/Drupal/views/Plugin/views/argument/GroupByNumeric.php

lib/Drupal/views/Plugin/views/argument/ManyToOne.php

lib/Drupal/views/Plugin/views/argument/Numeric.php

lib/Drupal/views/Plugin/views/argument/String.php

...ugin/views/argument_default/ArgumentDefaultPluginBase.php

lib/Drupal/views/Plugin/views/argument_default/Php.php