Don't return an unmod collection.

It's not needed as people can mess with this, and people do, so this fixes the build.
bug:8398355

Change-Id: Iddd00af41009c88b67fb7f9a8789bb416c377922
1 file changed
tree: 2d6923dba4fae0a1f6d7f5f7392530e1ea961a3d
  1. core/
  2. services/