message: Removing protobuf JSON util dependency.
  GitOrigin-RevId:
diff: #ifndef TINK_UTIL_PROTOBUF_HELPER_H_
  #define TINK_UTIL_PROTOBUF_HELPER_H_
  +// copybara:replace_start
  +// Keep synchronized with google3/third_party/tink/copybara/cc.bara.sky
  #ifdef PROTOBUF_INTERNAL_IMPL
  -// This space intentionally left blank. This is a placeholder for includes
  -// when the code is imported into Google's version control system.
  +#include "net/proto2/public/message.h"
  +
  +namespace portable_proto = ::proto2;
  #else
  +// copybara:replace_end
  #include "google/protobuf/message.h"
  -#include "google/protobuf/util/json_util.h"
  namespace portable_proto = ::google::protobuf;
  