Unify diagnostic names for uninitialized non-nullable fields
Unify diagnostic names for uninitialized non-nullable fields

Change-Id: I1aa63cbb6f8aa8f3496df348dc1bc415ae8b1373
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/136980
Reviewed-by: Konstantin Shcheglov <09e4d7516628963212bf4aace2f97603d2b706e4@google.com>
Commit-Queue: Brian Wilkerson <1f7641b6b14c52b9163524ab8d9aabff80176f21@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk