Remove unpacked extension warning

[consllogluke]

With Chromium, when you have an unpacked extension loaded, every time you open the browser it will warn you that it's "unsafe". This should be removed because it's extremely annoying, especially when you have no other choice (I use an extension to restore YouTube's classic look and Google took it off of the Chrome store).

[bsclifton]

@ireallydontwantthisaccount thanks for bringing that up - this is a highly requested feature that we have captured with #4349

I'll go ahead and close this issue as a dupe and give the original issue a +1 on your behalf