Update IRCLineURL hook to include RecentChange object

The Flow extension has need to change the url output by
the IRC formatter.  As a temporary fix this allows flow
to conditionally replace the url until RC can be adjusted
to inteligently generate URL's in a cross-extension way.

Change-Id: Ie951e52833a578fecd9423c2e6d3cc10816d7fef
Merge "Update IRCLineURL hook to include RecentChange object"