Always count non-core libs when tracking migration progress.
Always count non-core libs when tracking migration progress.

Now that they're farther along, there's little need to keep them
separate.

Change-Id: I3dedcf34b97cf5f0645fe429b357a459850d65d5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/135740
Auto-Submit: Bob Nystrom <afede3a9ebedb865bee78398feff6fbe97068f17@google.com>
Commit-Queue: Nicholas Shahan <03847abd2d8aadfe859ecb98095a31f9f515dc47@google.com>
Reviewed-by: Nicholas Shahan <03847abd2d8aadfe859ecb98095a31f9f515dc47@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