KJS: reimplement deleteProperty in Kotlin

js/js.libraries/src/core/core.kt

@@ -24,5 +24,6 @@ public external fun js(code: String): dynamic = noImpl
  */
 public inline fun jsTypeOf(a: Any?): String = js("typeof a")
 
-@library
-internal fun deleteProperty(`object`: Any, property: Any): Unit = noImpl
+internal inline fun deleteProperty(obj: Any, property: Any){
+    js("delete obj[property]")
+}

js/js.libraries/src/js/kotlin_lib.js

@@ -340,10 +340,6 @@ Kotlin.arrayFromFun = function (size, initFun) {
     return result;
 };
 
-Kotlin.deleteProperty = function (object, property) {
-    delete object[property];
-};
-
 Kotlin.jsonAddProperties = function (obj1, obj2) {
     for (var p in obj2) {
         if (obj2.hasOwnProperty(p)) {