Use v8AtomicString instead of v8::String::NewFromUtf8

Source/bindings/templates/methods.cpp

 {##############################################################################}
 {% macro generate_method(method, world_suffix) %}
 {% filter conditional(method.conditional_string) %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     {% if method.has_exception_state %}
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "{{method.name}}", "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {% if method.name in ['addEventListener', 'removeEventListener'] %}
     {{add_remove_event_listener_method(method.name) | indent}}
@@ skipping 253 matching lines @@
         return;
     }
     {{cpp_class}}* imp = {{v8_class}}::toNative(holder);
     if (!BindingSecurity::shouldAllowAccessToFrame(imp->frame(), DoNotReportSecurityError)) {
         static int sharedTemplateUniqueKey;
         v8::Handle<v8::FunctionTemplate> sharedTemplate = data->privateTemplate(currentWorldType, &sharedTemplateUniqueKey, {{cpp_class}}V8Internal::{{method.name}}MethodCallback{{world_suffix}}, v8Undefined(), v8::Signature::New(info.GetIsolate(), {{v8_class}}::domTemplate(info.GetIsolate(), currentWorldType)), {{method.number_of_required_or_variadic_arguments}});
         v8SetReturnValue(info, sharedTemplate->GetFunction());
         return;
     }
 
-    v8::Local<v8::Value> hiddenValue = info.This()->GetHiddenValue(v8::String::NewFromUtf8(info.GetIsolate(), "{{method.name}}", v8::String::kInternalizedString));
+    v8::Local<v8::Value> hiddenValue = info.This()->GetHiddenValue(v8AtomicString(info.GetIsolate(), "{{method.name}}"));
     if (!hiddenValue.IsEmpty()) {
         v8SetReturnValue(info, hiddenValue);
         return;
     }
 
     v8SetReturnValue(info, privateTemplate->GetFunction());
 }
 
 static void {{method.name}}OriginSafeMethodGetterCallback{{world_suffix}}(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
@@ skipping 83 matching lines @@
     v8::Handle<v8::Object> wrapper = info.Holder();
     {% if is_constructor_raises_exception %}
     if (exceptionState.throwIfNeeded())
         return;
     {% endif %}
 
     V8DOMWrapper::associateObjectWithWrapper<{{v8_class}}>(impl.release(), &{{v8_class}}Constructor::wrapperTypeInfo, wrapper, info.GetIsolate(), WrapperConfiguration::Dependent);
     v8SetReturnValue(info, wrapper);
 }
 {% endmacro %}