[co19] Enable Language/Libraries_and_Scripts tests

Change-Id: I9632efb404c7723258f64569fb5821b7a04941c0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152326
Reviewed-by: Alexander Thomas <[email protected]>

Author: sgrekhov

tests/co19/co19-co19.status

@@ -20,11 +20,6 @@ Language/Generics/Superbounded_types/typedef2_A01_t04: Skip # Non function type
 Language/Generics/parameter_A01_t03: Skip # Type aliases are not fully implemented
 Language/Generics/syntax_t31: Skip # Type aliases are not fully implemented
 Language/Generics/typedef_A01_t10: Skip # Type aliases are not fully implemented
-Language/Libraries_and_Scripts/*: Skip # Not migrated to NNBD
-Language/Libraries_and_Scripts/Exports/*: Skip # Not migrated to NNBD
-Language/Libraries_and_Scripts/Parts/*: Skip # Not migrated to NNBD
-Language/Libraries_and_Scripts/Scripts/*: Skip # Not migrated to NNBD
-Language/Libraries_and_Scripts/URIs/*: Skip # Not migrated to NNBD
 Language/Metadata/*: Skip # Not migrated to NNBD
 Language/Mixins/*: Skip # Not migrated to NNBD
 Language/Mixins/Mixin_Application/*: Skip # Not migrated to NNBD