6 files declare their use of ElementInfoManagerInterface

AjaxRenderer.php in core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php
FiberPlaceholderTest.php in core/modules/big_pipe/tests/src/Unit/Render/FiberPlaceholderTest.php
FieldConfigEditFormTest.php in core/modules/field_ui/tests/src/Unit/FieldConfigEditFormTest.php
FormBuilder.php in core/lib/Drupal/Core/Form/FormBuilder.php
LazyBuilders.php in core/modules/announcements_feed/src/LazyBuilders.php
WorkspacesLazyBuilders.php in core/modules/workspaces/src/WorkspacesLazyBuilders.php

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