Treat DownloadProvider as system

DownloadProvider had been treated as system because of MediaProvider and
DownloadProvider sharing same UID. Now, MediaProvider has a different
uid from DownloadProvider.

DownloadProvider was also treated as system because of all files access.
Id7f769b8e1fe680609b9f034e81c5425806128d1 changes that.

Legacy MediaProvider and DownloadProvider still share the same uid.
This CL allows DownloadProvider uid to be treated as system by treating
the legacy MediaProvider as system.

Test: atest CtsDownloadManagerApi28
Bug: 151768142
Change-Id: Id26cbf0bff94b08eef7a77ae8e23d71a2e1fc583
1 file changed