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This is a follow up to https://dart-review.googlesource.com/c/sdk/+/349881 Now that there's only one implementation of TypeConstraintGatherer, it can be merged with the abstract class. Change-Id: Iaf50548da2841c7dfb51126de9f746fac1a8ad0d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/350242 Commit-Queue: Chloe Stefantsova <cstefantsova@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>