clean up some apis (dart-lang/test_descriptor#30)

- drop support for Uri objects in DirectoryDescriptor.load
- Use Object? instead of dynamic for `FileDescriptor` contents parameter
- Remove `parents` param in DirectoryDescriptor.load
3 files changed
tree: 58f189bcf6344d1a85e927a76e384ad0174c9cfc
  1. pkgs/