A ContentProvider that wraps remote content providers that
(potentially) have been distributed to a UCB.
Before trying to pass a request to a 'real,' underlying content provider
(which will most likely be a remote content provider distributed to this
UCB), this proxy first activates any remote content providers that have
been distributed here, but are still inactive (see
RemoteContentProviderAcceptor and
XRemoteContentProviderActivator for more information).
The way this works might change, therefore this interface is marked as
deprectated.
