After the previous cleanups, this was a glorified map of scheme name
("anonymous http") to display name ("anonymous HTTP"), which required
a hand-written enum as well as a set of UI messages. It was only used
in the project info screen, not even from the much more commonly used
scheme dropdown on the change screen.
Change-Id: I1608971b50c75cb6957e01d558d54e48e22616dc