The attribute that configures / customizes the Menu and its respective buttons is menu
.
In the way you're using, I think you'll be able to remove the buttons like this:
editor_config.menu = {}
There is another way to implement Tinson's call in the form of Json.
For example:
tinymce.init({
selector: "#textarea",
toolbar: "bold italic underline | alignleft aligncenter alignright alignjustify",
menu : {},
plugins: "link",
link_list: [{title: 'Custumer', value: 'http://www.mywebsite.com.br'}],
target_list: [{title: 'Mesma Página', value: '_self'},{title: 'Nova Aba', value: '_blank'}]
});
Of course, the way you intend to implement it is of your choice, how you think it is easier and better for possible maintenance.