Remove unnecessary variables

lib/cartodb/models/mapconfig/provider/named-map-provider.js

@@ -56,9 +56,6 @@ NamedMapMapConfigProvider.prototype.getMapConfig = function(callback) {
         return callback(this.err, this.mapConfig, this.rendererParams, this.context);
     }
 
-    var mapConfig = null;
-    var apiKey;
-
     var context = {};
 
     this.getTemplate((err, template) => {
@@ -73,14 +70,12 @@ NamedMapMapConfigProvider.prototype.getMapConfig = function(callback) {
                 return callback(err);
             }
 
-            this.metadataBackend.getUserMapKey(this.owner, (err, _apiKey) => {
+            this.metadataBackend.getUserMapKey(this.owner, (err, apiKey) => {
                 if (err) {
                     this.err = err;
                     return callback(err);
                 }
 
-                apiKey = _apiKey;
-
                 var templateParams = {};
                 if (this.config) {
                     try {
@@ -117,14 +112,12 @@ NamedMapMapConfigProvider.prototype.getMapConfig = function(callback) {
                     }
                 };
 
-                this.mapConfigAdapter.getMapConfig(this.owner, requestMapConfig, rendererParams, context, (err, _mapConfig) => {
+                this.mapConfigAdapter.getMapConfig(this.owner, requestMapConfig, rendererParams, context, (err, mapConfig) => {
                     if (err) {
                         this.err = err;
                         return callback(err);
                     }
 
-                    mapConfig = _mapConfig;
-
                     this.userLimitsBackend.getRenderLimits(this.owner, this.params.api_key, (err, renderLimits) => {
                         if (err) {
                             this.err = err;