89e7cf3357
Closes https://github.com/dart-lang/sdk/issues/41361 Several named args were non-nullable with no default value. Fixes those instances and transforms some finals to late initialization. Change-Id: I2b223e6a8618ff3e98ced98a72f6bb87db1fe1c0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142555 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Leaf Petersen <leafp@google.com> Commit-Queue: Srujan Gaddam <srujzs@google.com>