Issue #2324791 by Michael Hodge Jr, ParisLiakos: Remove watchdog().

core/includes/bootstrap.inc

core/includes/common.inc

core/lib/Drupal/Core/Logger/LoggerChannel.php

core/modules/dblog/dblog.module

core/modules/dblog/src/Tests/DbLogTest.php

core/modules/system/src/Tests/Module/ModuleTestBase.php

...sts/Drupal/Tests/Core/Logger/LoggerChannelFactoryTest.php

core/tests/Drupal/Tests/Core/Logger/LoggerChannelTest.php