6 files declare their use of Schema

DriverSpecificSchemaTestBase.php in core/tests/Drupal/KernelTests/Core/Database/DriverSpecificSchemaTestBase.php
InstallerRedirectTraitTest.php in core/tests/Drupal/KernelTests/Core/Installer/InstallerRedirectTraitTest.php
Schema.php in core/modules/sqlite/src/Driver/Database/sqlite/Schema.php
Schema.php in core/modules/mysql/src/Driver/Database/mysql/Schema.php
Schema.php in core/modules/pgsql/src/Driver/Database/pgsql/Schema.php
Schema.php in core/tests/fixtures/database_drivers/module/core_fake/src/Driver/Database/CoreFakeWithAllCustomClasses/Schema.php

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