6 files declare their use of ConstraintViolationList in Plug 7

ConstraintViolationBuilder.php in lib/Symfony/validator/Symfony/Component/Validator/Violation/ConstraintViolationBuilder.php

ConstraintViolationListTest.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/ConstraintViolationListTest.php

ContextAwarePluginBase.php in lib/Drupal/Component/Plugin/ContextAwarePluginBase.php

Contains \Drupal\Component\Plugin\ContextAwarePluginBase.

ExecutionContext.php in lib/Symfony/validator/Symfony/Component/Validator/Context/ExecutionContext.php

LegacyExecutionContextTest.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/LegacyExecutionContextTest.php

StubGlobalExecutionContext.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/Fixtures/StubGlobalExecutionContext.php