JS backend: drop Kotlin.keys

js/js.translator/testFiles/kotlin_lib_ecma5.js

@@ -231,8 +231,6 @@ var Kotlin = {};
         return obj;
     };
 
-    Kotlin.keys = Object.keys; // TODO drop
-
     Kotlin.isType = function (object, klass) {
         if (object == null || klass == null) {
             return false;

js/js.translator/testFiles/maps.js

@@ -416,7 +416,7 @@ Kotlin.ComplexHashMap = Kotlin.HashMap;
             this.map = map;
         }, {
             iterator: function () {
-                return new PrimitiveHashMapValuesIterator(this.map.map, Kotlin.keys(this.map.map));
+                return new PrimitiveHashMapValuesIterator(this.map.map, Object.keys(this.map.map));
             },
             isEmpty: function () {
                 return this.map.$size === 0;
@@ -538,7 +538,7 @@ Kotlin.PrimitiveHashSet = Kotlin.createClass(Kotlin.AbstractCollection,
             this.map = {};
         },
         toArray: function () {
-            return Kotlin.keys(this.map);
+            return Object.keys(this.map);
         }
 });