Remove unneeded abstraction in displaying dialogs.

There was a series of message ids used to specify the dialog to show,
but since the mapping is 1-to-1, we can just specify the dialog's id
directly and show it. This cuts down on a layer of (now) unneeded
abstraction.

Bug: 17019623
Change-Id: Ibad20834e8626724542dc4f1b73bd88c9d9d5fdf
1 file changed