Remove ForceDelete

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index 407f2377940951417d1307052f554600876c8f89..d7126461498b9390b546e42087a74e5748638072 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -765,12 +765,9 @@ RUNTIME_FUNCTION(Runtime_DeleteProperty) {
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
   CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
   CONVERT_STRICT_MODE_ARG_CHECKED(strict_mode, 2);
-  JSReceiver::DeleteMode delete_mode = strict_mode == STRICT
-                                           ? JSReceiver::STRICT_DELETION
-                                           : JSReceiver::NORMAL_DELETION;
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, JSReceiver::DeleteProperty(object, key, delete_mode));
+      isolate, result, JSReceiver::DeleteProperty(object, key, strict_mode));
   return *result;
 }