Issue #1541674 by Berdir, Tor Arne Thune, sun, plach, dixon_, tim.plunkett: Remove the registry.

core/authorize.php

core/includes/bootstrap.inc

core/includes/common.inc

core/includes/install.inc

core/includes/module.inc

core/includes/registry.inc

core/lib/Drupal/Core/Database/Database.php

...ib/Drupal/Core/EventSubscriber/RequestCloseSubscriber.php

.../modules/simpletest/lib/Drupal/simpletest/WebTestBase.php

core/modules/simpletest/simpletest.module

...m/lib/Drupal/system/Tests/Upgrade/UpgradePathTestBase.php

core/modules/system/system.api.php

core/modules/system/system.install

core/modules/system/tests/registry.test