37ed87b038
Port the service tests and Observatory to Dart 3. Change-Id: I8a8b20d8f90acd3b5f741c93f10ba99971aa0c52 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/154825 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Ben Konyi <bkonyi@google.com>