Developers expect to mutate Downloads Uris.

A recent CL to better isolate DownloadManager from MediaProvider
uncovered that we had been ignoring changes to DOWNLOAD_URI and
REFERER_URI from apps, which causes important signals used for
malware detection to be lost.

This change enables mutation of these columns, which matches the
@Column annotations in MediaStore which claims they're mutable.

Bug: 159697525
Test: atest --test-mapping packages/providers/MediaProvider
Change-Id: I242d69af30f82bdcfa8ee3971c44902f407397e9
1 file changed