Revert method deletion

Author: dmdashenkov

datastore/src/main/java/io/spine/server/storage/datastore/DsRecordStorage.java

@@ -23,6 +23,7 @@
 import com.google.cloud.datastore.BaseEntity;
 import com.google.cloud.datastore.Entity;
 import com.google.cloud.datastore.Key;
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Functions;
 import com.google.protobuf.Any;
 import com.google.protobuf.FieldMask;
@@ -243,6 +244,19 @@ protected DatastoreWrapper getDatastore() {
         return datastore;
     }
 
+    /**
+     * Obtains the {@link TypeUrl} of the messages to save to this store.
+     *
+     * <p>Allows the customization of the storage behavior in descendants.
+     *
+     * @return the {@link TypeUrl} of the stored messages
+     */
+    @VisibleForTesting
+    // Otherwise this getter is not used
+    TypeUrl getTypeUrl() {
+        return typeUrl;
+    }
+
     protected Entity entityRecordToEntity(I id, EntityRecordWithColumns record) {
         EntityRecord entityRecord = record.getRecord();
         Key key = datastore.keyFor(kindFrom(entityRecord), ofEntityId(id));