Only change predicates need to have a match method, because for
historic reasons changes may be loaded from multiple sources.
Predicates for other indices do not need to implement a match method
because the data is always loaded from the index. An exception are
the predicates that check visibility for which a match method is
always required.
Change-Id: I3492bc83b6faf6708ab0102a49463aa0d4a3d10b
Signed-off-by: Edwin Kempin <ekempin@google.com>
cc82b24695