This removes the "youtube" definition from the require.js config, which means that any scripts that declare a dependency on "youtube" will fall back on the default and try to load `/static/$GIT_HASH/youtube.js` from edx.org, which is going to fail, because no such script exists. I'm not certain what you're trying to accomplish here, but this seems like the wrong way to fix the problem. Can you tell me what you're trying to do?