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Also: * Clean up obsolete code for returning null safety from kernel service. * Enable sound null safety in TFA unit tests. TEST=ci Change-Id: I1e008ed661823e9cb8004670d6b66bef35089a19 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/334081 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>