simplify index data fetching method (#908) rdar://135750840

simplify index data fetching method (#908) rdar://135750840

Author: hqhhuang

src/mixins/indexDataFetcher.js

@@ -20,17 +20,14 @@ export default {
     },
   },
   methods: {
-    async fetchIndexPathsData() {
-      return fetchData(this.indexDataPath);
-    },
     async fetchIndexData() {
       try {
         IndexStore.reset();
         const {
           includedArchiveIdentifiers = [],
           interfaceLanguages,
           references = {},
-        } = await this.fetchIndexPathsData();
+        } = await fetchData(this.indexDataPath);
         IndexStore.setFlatChildren(flattenNavigationIndex(interfaceLanguages));
         IndexStore.setTechnologyProps(extractTechnologyProps(interfaceLanguages));
         IndexStore.setReferences(references);