cf4550718f
Work towards https://github.com/dart-lang/sdk/issues/53402 None of the classes which were moved are changed in any way. Cq-Include-Trybots: luci.dart.try:flutter-analyze-try,analyzer-win-release-try,pkg-win-release-try Change-Id: If81098971de044e2f69c1039ec23eff07b108af6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/368066 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Samuel Rawlins <srawlins@google.com>