6 files declare their use of DrupalCoreComposer

BuilderInterface.php in composer/Generator/BuilderInterface.php
ComponentGenerator.php in composer/Generator/ComponentGenerator.php
DrupalPackageBuilder.php in composer/Generator/Builder/DrupalPackageBuilder.php
Fixtures.php in core/tests/Drupal/Tests/Composer/Generator/Fixtures.php
MetapackageUpdateTest.php in core/tests/Drupal/Tests/Composer/Generator/MetapackageUpdateTest.php
PackageGenerator.php in composer/Generator/PackageGenerator.php

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