Rename AuthAppi by AuthBackend

lib/cartodb/api/map/preview-layergroup-controller.js

@@ -18,7 +18,7 @@ module.exports = class PreviewLayergroupController {
         mapStore,
         userLimitsApi,
         layergroupAffectedTablesCache,
-        authApi,
+        authBackend,
         surrogateKeysCache
     ) {
         this.previewBackend = previewBackend;
@@ -26,7 +26,7 @@ module.exports = class PreviewLayergroupController {
         this.mapStore = mapStore;
         this.userLimitsApi = userLimitsApi;
         this.layergroupAffectedTablesCache = layergroupAffectedTablesCache;
-        this.authApi = authApi;
+        this.authBackend = authBackend;
         this.surrogateKeysCache = surrogateKeysCache;
     }
 
@@ -37,7 +37,7 @@ module.exports = class PreviewLayergroupController {
             `/static/center/:token/:z/:lat/:lng/:width/:height.:format`,
             layergroupToken(),
             credentials(),
-            authorize(this.authApi),
+            authorize(this.authBackend),
             dbConnSetup(this.pgConnection),
             rateLimit(this.userLimitsApi, RATE_LIMIT_ENDPOINTS_GROUPS.STATIC),
             cleanUpQueryParams(['layer']),
@@ -59,7 +59,7 @@ module.exports = class PreviewLayergroupController {
             `/static/bbox/:token/:west,:south,:east,:north/:width/:height.:format`,
             layergroupToken(),
             credentials(),
-            authorize(this.authApi),
+            authorize(this.authBackend),
             dbConnSetup(this.pgConnection),
             rateLimit(this.userLimitsApi, RATE_LIMIT_ENDPOINTS_GROUPS.STATIC),
             cleanUpQueryParams(['layer']),