Workaround crash that can happen in Electron/Chromium

[Tyriar]

Part of microsoft/vscode#189753

cc @deepak1556

[jerch]

Eww, is this style element handling browser-alpha ground? Tbh I dont like where this is going - should we revert the style stuff to a more proven code pattern?

On a sidenote - not even sure how recent engines need to be to support this - did we just raise the version requirements to newest browsers only by adding by #4611?

Edit:
Indeed #4611 will only work with newest Safari released in April, see https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet?retiredLocale=en, also Firefox needs be quite new. I'd suggest to revert #4611, or we lose support on some browser engines older than 6 months. 😱

[Tyriar]

We can now actually reproduce this in Chromium, so I'm also thinking we should just revert the whole CSP change as it doesn't seem like it's ready for primetime. FYI @SimonSiefke

[SimonSiefke]

Sorry for the breakage caused by my changes. I also agree that reverting the changes is the best option!

On a sidenote - not even sure how recent engines need to be to support this - did we just raise the version requirements to newest browsers only by adding by #4611?

The change uses try/catch and falls back to <style> elements, It seems to me it should be backwards compatible - apart from crashing chromium ;)