data: drop unused trackAdditionalNameList preview

Weirdly this stuck around while the parts it was composed from,
for shared and inferred additional names, were dropped earlier.

1 files changed, 0 insertions, 8 deletions

diff --git a/src/validators.js b/src/validators.js
index d45560fc..31706a89 100644
--- a/src/validators.js
+++ b/src/validators.js
@@ -979,14 +979,6 @@ export function validateWikiData({
   };
 }
 
-export function isAdditionalName() {
-  throw new Error('deprecated');
-}
-
-export function isAdditionalNameList() {
-  throw new Error('deprecated');
-}
-
 // Compositional utilities
 
 export function anyOf(...validators) {