Drop support for defunct Chakra host

[amcasey]

I'm experimenting with some host changes, so this seems like a good time to tidy up (rather than update) the Chakra host.

[DanielRosenwasser]

I know it's an experiment, but don't merge this until post-RC please.

[amcasey]

@DanielRosenwasser It's not an experiment - this code is dead. It came up because I would have had to update it in my experiment. 😄 I'm happy to wait though.

[weswigham]

The code is "dead" except we've heard of non-chakra consumers in, eg, the browser, providing the ChakraHost global to our spec in order to provide sys in the past, so removing it is still probably a break.

[amcasey]

@weswigham I'll close this then?

[weswigham]

I dunno - we might be able to remove it, we just have to be aware that it's a break.

[amcasey]

@DanielRosenwasser @weswigham How do we feel about this?

[RyanCavanaugh]

I'm pretty comfortable removing it at this point.

@mihailik FYI in case this is how you were shimming

[sandersn]

This has been out for several months now, so I think it's time to merge it.