message: Prepare for switch of KeyData.value to STRING_PIECE
diff: @@ -78,7 +78,7 @@ util::Status SetRsaSsaPssParameters(const PemKeyParams& pem_parameters,
  // `key_material_type`.
  Keyset::Key NewKeysetKey(uint32_t key_id, absl::string_view key_type,
  const KeyData::KeyMaterialType& key_material_type,
  - absl::string_view key_data) {
  + const std::string& key_data) {
  Keyset::Key key;
  // Populate KeyData for the new key.
  key.set_key_id(key_id);
  @@ -87,7 +87,7 @@ Keyset::Key NewKeysetKey(uint32_t key_id, absl::string_view key_type,
  key.set_output_prefix_type(OutputPrefixType::RAW);
  KeyData* key_data_proto = key.mutable_key_data();
  key_data_proto->set_type_url(key_type.data(), key_type.size());
  - key_data_proto->set_value(key_data.data(), key_data.size());
  + key_data_proto->set_value(key_data);
  key_data_proto->set_key_material_type(key_material_type);
  return key;
  }
  