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to DDC when the front end server was started with the `--debugger-module-names` flag. Followup to https://dart-review.googlesource.com/c/sdk/+/456500 It appears the flag is entirely unused in our supported environments. There are tests for it so this change preserves the previous behavior in the tests until I can confirm there are no real usages. See: https://github.com/dart-lang/webdev/blob/382ff428a8bc2e32830aa9d763b1887759435ed6/dwds/test/frontend_server_circular_evaluate_test.dart#L34 Change-Id: I25688e8b0d7d69779f2d58466a0c9d076a670b61 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/459661 Commit-Queue: Nicholas Shahan <nshahan@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>