Automattic/jetpack — pull request #1389 by enejb (2014-12-10 06:59:07+00:00)
Title: General: Updates site_icon_id, site_icon_url and main_network_site

So that they are prefixed with jetpack_
Updated site_icon_id to jetpack_site_id
site_icon_url to jetpack_site_icon_url and
jetpack_main_network_site.

This will hopefully prevent any future name space collisions with other plugins.