Fix keyed access of primitive objects in the runtime.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index be0fb6df12af30867c515782b5d6ab5979722a0d..79ae57356121a3352149120eb02ecb025510fb70 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -12332,16 +12332,6 @@ void JSObject::ValidateElements(Handle<JSObject> object) {
 }
 
 
-// static
-MaybeHandle<Object> JSReceiver::SetElement(Handle<JSReceiver> object,
-                                           uint32_t index, Handle<Object> value,
-                                           LanguageMode language_mode) {
-  Isolate* isolate = object->GetIsolate();
-  LookupIterator it(isolate, object, index);
-  return SetProperty(&it, value, language_mode, MAY_BE_STORE_FROM_KEYED);
-}
-
-
 static bool ShouldConvertToSlowElements(JSObject* object, uint32_t capacity,
                                         uint32_t index,
                                         uint32_t* new_capacity) {