[DO NOT LAND] Set @@toStringTag for DOM object prototypes

Source/bindings/tests/results/core/V8TestInterfaceWillBeGarbageCollected.cpp

Index: Source/bindings/tests/results/core/V8TestInterfaceWillBeGarbageCollected.cpp
diff --git a/Source/bindings/tests/results/core/V8TestInterfaceWillBeGarbageCollected.cpp b/Source/bindings/tests/results/core/V8TestInterfaceWillBeGarbageCollected.cpp
index fcc302b78cb5610960482bbce192c02b24a421d6..765fbbd7f85d839e943d27fc52a1628a1ded662f 100644
--- a/Source/bindings/tests/results/core/V8TestInterfaceWillBeGarbageCollected.cpp
+++ b/Source/bindings/tests/results/core/V8TestInterfaceWillBeGarbageCollected.cpp
@@ -145,7 +145,6 @@ v8::Local<v8::FunctionTemplate> V8TestInterfaceWillBeGarbageCollectedConstructor
     result = v8::FunctionTemplate::New(isolate, V8TestInterfaceWillBeGarbageCollectedConstructorCallback);
     v8::Local<v8::ObjectTemplate> instanceTemplate = result->InstanceTemplate();
     instanceTemplate->SetInternalFieldCount(V8TestInterfaceWillBeGarbageCollected::internalFieldCount);
-    result->SetClassName(v8AtomicString(isolate, "TestInterfaceWillBeGarbageCollected"));
     result->Inherit(V8TestInterfaceWillBeGarbageCollected::domTemplate(isolate));
     data->setDOMTemplate(&domTemplateKey, result);
     return result;
@@ -187,6 +186,8 @@ static void installV8TestInterfaceWillBeGarbageCollectedTemplate(v8::Local<v8::F
     };
     V8DOMConfiguration::installMethod(isolate, instanceTemplate, defaultSignature, static_cast<v8::PropertyAttribute>(v8::DontDelete | v8::ReadOnly), funcMethodConfiguration);
 
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceWillBeGarbageCollected"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }