Update pre-NNBD TypeSchemaEnvironmentTest to use NNBD libraries.
Since legacy libraries are no longer supported, the only remaining
functionality that this test exercises is the behavior of legacy
("star") types (which can still occur in unsound mode builds). This
functionality can be tested equally well regardless of whether the
containing library has null safety enabled.
By switching the test over so that the containing library has null
safety enabled, we remove the last piece of code that was configuring
libraries in legacy mode. This will pave the way for removing support
for legacy libraries from the type system, which will in turn make it
easier to share type system logic between the analyzer and front end.
Change-Id: I32495e59a1b6680b1f13407c4199df9e09f6d6a0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/367364
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
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