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This aligns this code better with Effective Dart and prepares for the upcoming lint rule change at https://dart-review.googlesource.com/c/sdk/+/353140. Change-Id: I4a419c50b851680150d4f17941bc0f94a98cb148 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/353221 Reviewed-by: Jens Johansen <jensj@google.com> Commit-Queue: Jens Johansen <jensj@google.com> Auto-Submit: Samuel Rawlins <srawlins@google.com>