Remove one more case behind --es5_readonly flag.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 10242 matching lines @@
 
 
 static v8::Handle<Value> ChildGetter(Local<String> name,
                                      const AccessorInfo& info) {
   ApiTestFuzzer::Fuzz();
   return v8_num(42);
 }
 
 
 THREADED_TEST(Overriding) {
+  i::FLAG_es5_readonly = true;
   v8::HandleScope scope;
   LocalContext context;
 
   // Parent template.
   Local<v8::FunctionTemplate> parent_templ = v8::FunctionTemplate::New();
   Local<ObjectTemplate> parent_instance_templ =
       parent_templ->InstanceTemplate();
   parent_instance_templ->SetAccessor(v8_str("f"), ParentGetter);
 
   // Template that inherits from the parent template.
@@ skipping 6315 matching lines @@
   v8::V8::SetFatalErrorHandler(CountingErrorCallback);
   v8::Utils::ReportApiFailure("StringEmpty()", "Kill V8");
   i::Isolate::Current()->TearDown();
   CHECK(!i::Internals::IsInitialized(isolate));
   CHECK_EQ(1, fatal_error_callback_counter);
   CHECK(v8::String::Empty().IsEmpty());
   CHECK_EQ(2, fatal_error_callback_counter);
   CHECK(v8::String::Empty(isolate).IsEmpty());
   CHECK_EQ(3, fatal_error_callback_counter);
 }