24b14ce246
This is in preparation for a change in the CFE that stops support for 'import augment'. Change-Id: Ia33b815ec554bae03e3a916ce22830b36e504771 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/413221 Reviewed-by: Chloe Stefantsova <cstefantsova@google.com> Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>