Deprecate ExtensionRegistryInitializer in protobuf support [SPR-17081]

[spring-projects-issues]

Sébastien Deleuze opened SPR-17081 and commented

In order to be consistent with #20331, and since it does not provide clear added value, this issue is about deprecating ExtensionRegistryInitializer and using ExtensionRegistry parameter instead in ProtobufHttpMessageConverter and ProtobufJsonFormatHttpMessageConverter constructors.

---

Issue Links:

• Support Protobuf serialization in WebFlux [SPR-15776] #20331 Support Protobuf serialization in WebFlux

Referenced from: commits 36bbbab