6 files declare their use of LanguageNegotiationCookie in Language Cookie 8

LanguageCookieConditionMethodIsValid.php in src/Plugin/LanguageCookieCondition/LanguageCookieConditionMethodIsValid.php

LanguageCookieLanguageSelectionPageTest.php in tests/src/Functional/LanguageCookieLanguageSelectionPageTest.php

LanguageCookieSubscriber.php in src/EventSubscriber/LanguageCookieSubscriber.php

LanguageCookieTestBase.php in tests/src/Functional/LanguageCookieTestBase.php

language_cookie.install in ./language_cookie.install

The install and update code for the language_cookie module.

language_cookie.module in ./language_cookie.module

Language Cookie module.