Don’t do that, you will know Pain and Suffering? if you do it that way.
It’s a little more complicated than that. Editing the file will get your changes erased when a WordPress update comes out. It’s one reason why editing core WordPress files isn’t a good idea.
Give this a read.
New Embeds Feature in WordPress 4.4
And once your head stops spinning you may find the filter that you should use instead. ??
If I have time today I’ll take a look at how to do it correctly and provide the code. Or maybe someone else will chime it. It shouldn’t be hard to customize that logo.
