Adjust Uri changes collection from List to Set.

Partners have pointed out that when several operations are performed
on a single Uri inside a transaction, duplicate notifications can be
sent.  This change adjusts to using a Set<Uri> to collapse any
duplicate Uris.

Bug: 147778086
Test: atest --test-mapping packages/providers/MediaProvider
Change-Id: I3731196ecac4729bbbd037464ee0432094fa84aa
1 file changed