Ask HN: Why do mobile browsers no longer support native camera input?

It used to be the case that the W3 standard getusermedia API worked on mobile browsers. Since roughly a year or so ago this support was largely dropped, and there is no cross platform way to access the native camera inside a mobile browser with HTML5.

Does anyone know why this is not supported? Is it strictly that handset makers want to drive users to native apps that utilize camera functions?