Roll Dart Protobuf Support from b149f801cf7a to 408f69b98b2d (9 revisions)

https://dart.googlesource.com/protobuf/+log/b149f801cf7a..408f69b98b2d

2022-06-08 omersa@google.com Update documentation according to Effective Dart documentation guide (#664)
2022-06-02 omersa@google.com Move closures in proto3 deserializer to top-level (#668)
2022-06-02 omersa@google.com Refactor protobuf bench runners, update README: (#665)
2022-06-02 omersa@google.com Benchmarks: add proto3 ser/deser benchs, move common code to common.dart (#667)
2022-06-02 omersa@google.com Remove makeLongInt helper (#666)
2022-05-31 lorenvs@outlook.com Use `-O4` when compiling benchmarks. (#552)
2022-05-25 omersa@google.com Remove invalid check in `_FieldSet.writeFieldValue` (#660)
2022-05-20 devoncarew@gmail.com Refactor file locations, update READMEs (#657)
2022-05-19 omersa@google.com Remove trailing whitespace in protoc_plugin/README

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-protobuf-dart-sdk
Please CC dart-ecosystem-gardener@grotations.appspotmail.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Dart Protobuf Support: https://github.com/dart-lang/protobuf/issues
To file a bug in Dart SDK: https://github.com/dart-lang/sdk/issues

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Tbr: dart-ecosystem-gardener@grotations.appspotmail.com
Change-Id: I0f1aa66ee6fe167f37443957234f4d0140828416
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/247467
Reviewed-by: Devon Carew <devoncarew@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>

Author: DEPS Autoroller

DEPS

@@ -133,7 +133,7 @@ vars = {
   "path_rev": "3d41ea582f5b0b18de3d90008809b877ff3f69bc",
   "ply_rev": "604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_rev": "c40cc32eabecb9d60f1045d1403108d968805f9a",
-  "protobuf_rev": "b149f801cf7a5e959cf1dbf72d61068ac275f24b",
+  "protobuf_rev": "408f69b98b2d2de947c4922506416e2ca4905ad5",
   "pub_rev": "51435efcd574b7bc18d47a5dd620cb9759dea8f8",
   "pub_semver_rev": "5c0b4bfd5ca57fe16f1319c581dc8c882e9b8cb2",
   "root_certificates_rev": "692f6d6488af68e0121317a9c2c9eb393eb0ee50",