This is a reland of commit 608934e330
Can be landed when Flutter with https://github.com/flutter/flutter/pull/123211
has been rolled into internal repository.
Original change's description:
> Reland "Add class modifiers to `dart:convert`."
>
> This is a reland of commit b2f4cf3e01
>
> Commented out deprecation for now.
>
> Original change's description:
> > Add class modifiers to `dart:convert`.
> >
> > The usual approach:
> > Pure interfaces marked `interface`.
> > Pure implementation classes marked `final`.
> > Base classes marked `base` or nothing, and `mixin class` if reasonable.
> > Combined X/XBase/XMixin where possible.
> >
> > CoreLibraryReviewExempt: Aske is away
> > Change-Id: I927f9bd488fb385ff9c17c8fc94920a1f5076347
> > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/289200
> > Reviewed-by: Stephen Adams <sra@google.com>
> > Reviewed-by: Slava Egorov <vegorov@google.com>
> > Reviewed-by: Nate Bosch <nbosch@google.com>
> > Commit-Queue: Lasse Nielsen <lrn@google.com>
>
> CoreLibraryReviewExempt: Approved in original.
> Change-Id: I1bc14f99b742567e2634dcfcbc52f332dbcc5364
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/290521
> Reviewed-by: Nate Bosch <nbosch@google.com>
> Commit-Queue: Lasse Nielsen <lrn@google.com>
CoreLibraryReviewExempt: Approved in original.
Change-Id: If157e1ef2339d7a06e99a1e402f2f8ac93550b83
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/290960
Reviewed-by: Nate Bosch <nbosch@google.com>
Commit-Queue: Lasse Nielsen <lrn@google.com>
f6ac970290