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They are used mostly as dependency tracking, because without combinators we don't know specific elements exported/imported. But for such dependency purpose CompilationUnitElement level "dependencies" are useless, so we should keep them at LibraryElement, but not add to CompilationUnitElement. Change-Id: I14aaf14debaf167f29740e86d82ff2c02e241569 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/389142 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>