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"DDC" is now the accepted name for the module system. Change-Id: I655219ccc7cff7ff99b1311518ef6ed6e7d1b2a6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/348085 Reviewed-by: Jake Macdonald <jakemac@google.com> Commit-Queue: Mark Zhou <markzipan@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com>