Remove the commitMessageNotForChange branch. CherryPickChange doesn't even use this anymore. Don't require setting the ChangeMessage, just the message string. Unlike PatchSetInserter, ChangeInserter creates the PatchSet immediately, because it doesn't have to scan refs to determine the next patch set ID (it's always 1). Change-Id: I166374c197413cad8d9036790d252154f9a0b9aa