message: Add a missing ProtobufStringToString.
diff: @@ -48,7 +48,7 @@ Status ParseAny(const google::protobuf::Any& any, T* message,
  "Expected Any type_url for: ", type_name,
  ". Got: ", string(any.type_url().data(), any.type_url().size()), ".");
  }
  - if (!message->ParseFromString(any.value())) {
  + if (!message->ParseFromString(ProtobufStringToString(any.value()))) {
  return errors::FailedPrecondition("Failed to unpack: ",
  DebugStringIfAvailable(any));
  }
  