Revert "preload youtube when using JS API"
Revert "preload youtube when using JS API"

This reverts commit 14bc6924a58faa8912943febfb11de3ee28caa52.

tlhunter/mixpanel-js,getto23/mixpanel-js,getto23/mixpanel-js,getto23/mixpanel-js,tlhunter/mixpanel-js,tlhunter/mixpanel-js