Clean up app-link verification policy

If an app claims to be the official auto-verified app for any domain
and thus the automatic handler for ACTION_VIEW / {http,https}://...
intents naming that domain, then we require that it verify as the
official app for *all* domains it purports to handle, even if the
other domains are not flagged for verify.

Bug 21335460

Change-Id: I3fdd8620defa31aea36ce738fa63ac94fc53c5f7