Roll Dart Protobuf Support from 408f69b98b2d to 3105588b8e51 (9 revisions)

https://dart.googlesource.com/protobuf/+log/408f69b98b2d..3105588b8e51

2022-06-15 [email protected] Remove unused function
2022-06-15 [email protected] Simplify PbList implementation, fix freezing (#626)
2022-06-15 [email protected] Remove frozen message modification handling (#643)
2022-06-15 [email protected] Bump version number for development, add changelog entry for #644
2022-06-15 [email protected] Remove ReadonlyMessageMixin (#644)
2022-06-15 [email protected] Release protobuf-2.1.0, protoc_plugin-20.0.1 (#677)
2022-06-14 [email protected] Specify `GeneratedMessage operator==` argument type (#675)
2022-06-14 [email protected] Add changes since the last protobuf release to CHANGELOG (#619)
2022-06-10 [email protected] Tweak consts.dart docs (#674)

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Tbr: [email protected]
Change-Id: If0f2beb1f63ef9a7527abaa116d883ef0fd4b6c9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/248620
Commit-Queue: Nate Bosch <[email protected]>
Reviewed-by: Nate Bosch <[email protected]>

Author: DEPS Autoroller

DEPS

@@ -132,7 +132,7 @@ vars = {
   "path_rev": "3d41ea582f5b0b18de3d90008809b877ff3f69bc",
   "ply_rev": "604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_rev": "c40cc32eabecb9d60f1045d1403108d968805f9a",
-  "protobuf_rev": "408f69b98b2d2de947c4922506416e2ca4905ad5",
+  "protobuf_rev": "3105588b8e515a3391ac5f0673cc06e16d0e3c0c",
   "pub_rev": "c4e9ddc888c3aa89ef4462f0c4298929191e32b9",
   "pub_semver_rev": "5c0b4bfd5ca57fe16f1319c581dc8c882e9b8cb2",
   "root_certificates_rev": "692f6d6488af68e0121317a9c2c9eb393eb0ee50",