Revert "(bug 51640) wgUserNewMsgRevisionId is null with only one rev"

This reverts commit b9e5b2f64a9758c4dfa9be47f46e3b4a8d318c9d.

Change-Id: I64cd03dd0789f482221f8f38bbf9a034025e45f9
Merge "Revert "(bug 51640) wgUserNewMsgRevisionId is null with only one rev""