Add Chrome/Safari versions for api.HTMLInputElement.search_event

[queengooborg]

This PR adds real values for Chrome and Safari for the search_event member of the HTMLInputElement API. The data was copied from its event handler counterparts.

[foolip]

Can you test this? I wonder if there are multiple "search" events and if it's actually fired going back to Safari 1. I find it suspicious that Edge wouldn't have supported this if it's that old.

[gsnedders]

Can you test this? I wonder if there are multiple "search" events and if it's actually fired going back to Safari 1. I find it suspicious that Edge wouldn't have supported this if it's that old.

My exceptionally distant memory is that the search stuff came alongside Tiger, which implies earlier didn't support it?

[foolip]

Thanks @gsnedders! Tiger would mean Safari 2, and this led me to notice that maybe Safari 1.3 is a backport, I've commented in #11909 (comment).

Here I think we should go with Safari 2, trusting @gsnedders' distant memory, rather than trying to determine for sure if it worked in 1.3.