message: Mark the functions which are overriden in KeyManagerBase with override.
  GitOrigin-RevId:
diff: @@ -37,7 +37,7 @@ class KeyFactoryBase : public KeyFactory {
  KeyFactoryBase() {}
  crypto::tink::util::StatusOr<std::unique_ptr<portable_proto::MessageLite>>
  - NewKey(const portable_proto::MessageLite& key_format) const {
  + NewKey(const portable_proto::MessageLite& key_format) const override {
  if (key_format.GetTypeName() != KeyFormatProto().GetTypeName()) {
  return crypto::tink::util::Status(
  util::error::INVALID_ARGUMENT,
  @@ -52,7 +52,7 @@ class KeyFactoryBase : public KeyFactory {
  }
  crypto::tink::util::StatusOr<std::unique_ptr<portable_proto::MessageLite>>
  - NewKey(absl::string_view serialized_key_format) const {
  + NewKey(absl::string_view serialized_key_format) const override {
  KeyFormatProto key_format;
  if (!key_format.ParseFromString(std::string(serialized_key_format))) {
  return crypto::tink::util::Status(
  @@ -64,7 +64,7 @@ class KeyFactoryBase : public KeyFactory {
  }
  crypto::tink::util::StatusOr<std::unique_ptr<google::crypto::tink::KeyData>>
  - NewKeyData(absl::string_view serialized_key_format) const {
  + NewKeyData(absl::string_view serialized_key_format) const override {
  auto new_key_result = NewKey(serialized_key_format);
  if (!new_key_result.ok()) return new_key_result.status();
  auto new_key =
  