Remove `passive` event listener flag?

[trotzig]

I was reading up on EventTarget.addEventListener and came across this section:

Setting passive isn't important for the basic scroll event, as it cannot be canceled, so its listener can't block page rendering anyway.

We introduced passive listeners in 3ad940e, but I think that has no effect on performance and we can remove it. We do use it for both the scroll event and the resize event. I think it might have effect for resize, but performance isn't really important for that event (people don't normally resize their browsers).

@lencioni I'm interested to get your input here.

[jamesplease]

After reading that article, and a few other ones on the topic, this seems right to me. But I'll also defer to @lencioni .

[lencioni]

Yeah, I think you are right--scroll and resize events can't be canceled. It seems fine to remove it.