13 files declare their use of ContextManager in Context 8

BlockDeleteForm.php in src/Reaction/Blocks/Form/BlockDeleteForm.php

BlockFormBase.php in src/Reaction/Blocks/Form/BlockFormBase.php

BlockPageDisplayVariantSubscriber.php in src/EventSubscriber/BlockPageDisplayVariantSubscriber.php

Contains \Drupal\context\EventSubscriber\BlockPageDisplayVariantSubscriber.

ConditionDeleteForm.php in modules/context_ui/src/Form/ConditionDeleteForm.php

ContextBlockPageVariant.php in src/Plugin/DisplayVariant/ContextBlockPageVariant.php

ContextDeleteForm.php in modules/context_ui/src/Form/ContextDeleteForm.php

ContextDisableForm.php in modules/context_ui/src/Form/ContextDisableForm.php

ContextFormBase.php in modules/context_ui/src/Form/ContextFormBase.php

ContextListBuilder.php in modules/context_ui/src/ContextListBuilder.php

ContextReactionBlocksController.php in src/Reaction/Blocks/Controller/ContextReactionBlocksController.php

ContextUIController.php in modules/context_ui/src/Controller/ContextUIController.php

ReactionDeleteForm.php in modules/context_ui/src/Form/ReactionDeleteForm.php

ThemeSwitcherNegotiator.php in src/Theme/ThemeSwitcherNegotiator.php