d2331fd8fc
These fields were not being used. Removing them will make it easier to move these classes into pkg/nnbd_migration. Change-Id: I7528bc07e5efd3936a9c6fd1635415e139d5df43 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144466 Reviewed-by: Samuel Rawlins <srawlins@google.com>