message: Replace the deprecated crypto::tink::util::Status::UNKNOWN object with a call to an absl-compatible constructor.
diff: @@ -104,12 +104,14 @@ class TestKeyFactory : public KeyFactory {
  util::StatusOr<std::unique_ptr<portable_proto::MessageLite>> NewKey(
  const MessageLite& key_format) const override {
  - return util::Status::UNKNOWN;
  + return util::Status(absl::StatusCode::kUnknown,
  + "TestKeyFactory cannot produce a key");
  }
  util::StatusOr<std::unique_ptr<portable_proto::MessageLite>> NewKey(
  absl::string_view serialized_key_format) const override {
  - return util::Status::UNKNOWN;
  + return util::Status(absl::StatusCode::kUnknown,
  + "TestKeyFactory cannot produce a key");
  }
  util::StatusOr<std::unique_ptr<KeyData>> NewKeyData(
  @@ -137,7 +139,8 @@ class TestAeadKeyManager : public KeyManager<Aead> {
  util::StatusOr<std::unique_ptr<Aead>>
  GetPrimitive(const MessageLite& key) const override {
  - return util::Status::UNKNOWN;
  + return util::Status(absl::StatusCode::kUnknown,
  + "TestKeyFactory cannot construct an aead");
  }
  