Revert "New Hook rc/watchlist hook ChangesListBegin"

This reverts commit 01798c3813b602bd3e8f9a666249e6da58526109.

The patch set changed a RecentChanges interface used in at least the
extension CleanChanges so that it was generating a lot of warnings.
Additional parameters to existing methods that are used elsewhere
should have defaults to not break backward compatibility.

Change-Id: I1851e23e186ba7aaeb001ba212e56888657a3ae0
Merge "Revert "New Hook rc/watchlist hook ChangesListBegin""