Rename user limits api by user limits backend

lib/cartodb/api/map/anonymous-map-controller.js

@@ -29,7 +29,7 @@ const { RATE_LIMIT_ENDPOINTS_GROUPS } = rateLimit;
  * @param {MapBackend} mapBackend
  * @param metadataBackend
  * @param {SurrogateKeysCache} surrogateKeysCache
- * @param {UserLimitsApi} userLimitsApi
+ * @param {UserLimitsBackend} userLimitsBackend
  * @param {LayergroupAffectedTables} layergroupAffectedTables
  * @param {MapConfigAdapter} mapConfigAdapter
  * @param {StatsBackend} statsBackend
@@ -41,7 +41,7 @@ function AnonymousMapController (
     mapBackend,
     metadataBackend,
     surrogateKeysCache,
-    userLimitsApi,
+    userLimitsBackend,
     layergroupAffectedTables,
     mapConfigAdapter,
     statsBackend,
@@ -53,7 +53,7 @@ function AnonymousMapController (
     this.mapBackend = mapBackend;
     this.metadataBackend = metadataBackend;
     this.surrogateKeysCache = surrogateKeysCache;
-    this.userLimitsApi = userLimitsApi;
+    this.userLimitsBackend = userLimitsBackend;
     this.layergroupAffectedTables = layergroupAffectedTables;
     this.mapConfigAdapter = mapConfigAdapter;
     this.statsBackend = statsBackend;
@@ -80,7 +80,7 @@ AnonymousMapController.prototype.composeCreateMapMiddleware = function () {
         credentials(),
         authorize(this.authBackend),
         dbConnSetup(this.pgConnection),
-        rateLimit(this.userLimitsApi, RATE_LIMIT_ENDPOINTS_GROUPS.ANONYMOUS),
+        rateLimit(this.userLimitsBackend, RATE_LIMIT_ENDPOINTS_GROUPS.ANONYMOUS),
         cleanUpQueryParams(['aggregation']),
         initProfiler(isTemplateInstantiation),
         checkJsonContentType(),
@@ -88,7 +88,7 @@ AnonymousMapController.prototype.composeCreateMapMiddleware = function () {
         prepareAdapterMapConfig(this.mapConfigAdapter),
         createLayergroup (
             this.mapBackend,
-            this.userLimitsApi,
+            this.userLimitsBackend,
             this.pgConnection,
             this.layergroupAffectedTables
         ),
@@ -166,7 +166,7 @@ function prepareAdapterMapConfig (mapConfigAdapter) {
     };
 }
 
-function createLayergroup (mapBackend, userLimitsApi, pgConnection, affectedTablesCache) {
+function createLayergroup (mapBackend, userLimitsBackend, pgConnection, affectedTablesCache) {
     return function createLayergroupMiddleware (req, res, next) {
         const requestMapConfig = req.body;
 
@@ -185,7 +185,7 @@ function createLayergroup (mapBackend, userLimitsApi, pgConnection, affectedTabl
         const mapConfigProvider = new CreateLayergroupMapConfigProvider(
             mapConfig,
             user,
-            userLimitsApi,
+            userLimitsBackend,
             pgConnection,
             affectedTablesCache,
             params